A collaboration of these wild guys and professors!

The new Ph.D. collaboration
monster SOLID is amazing!

1.Well-balanced scissors with our G-SHIFT / wobble prevention functionality for comfortable handling

When using scissors that can’t fix the handle in place and don’t have good balance, it takes extra effort to prevent wobbling. For stylists who open and close their scissors hundreds of times in a single day, even the slightest extra work can cause problems like tendovaginitis. With the innovative new “G-SHIFT” design, the scissors’ center of gravity is shifted closer to the hand, while keeping the balance set and avoiding increased centrifugal force during opening and closing operations. Together with the new handle that molds perfectly to your hand, these elements stabilize the blades, and prevent wobbling during cutting.

SOLID’s center of gravity By shifting the center of gravity closer to the hand than conventional scissors, its stability is improved.


We investigated muscle activity in the hand at the Chiba Institute of Technology. Comparison of muscle activity: SOLID (Prototype) and other products. For the basic operation of scissors (opening → closing), muscle activity when using the SOLID (Prototype) was reduced by 29.7% compared to other products.
Source: Yukari Aoki, “Effects of the Way Styling Scissors are Held on Usability” (Ueno Laboratory, 2011 Graduate Study)


2.Thrust Bearing design for ultra smooth operation that won’t tire you out / Thrust Bearing

The joint section has the important role of joining the blade and the handle, and in these scissors, it’s fitted with 9 precision ball bearings. Thanks to this design, the movement is smooth as silk.

Thrust Bearing

3.Powerful and long-lasting / Extramarise Processing

The new SOLID uses our proprietary Extramarise® Processing, a unique hardening process based on thorough temperature management that brings out the characteristics of the materials to the greatest extent possible. This process gives the scissors the hardness they need, as well as sufficient durability. This time, with the cooperation of the metals engineering expert Dr. Asakura, we’ve analyzed the structure of the SOLID’s raw material following the proper heat treatment processing. Comparing the SOLID’s treated material with other untreated materials, the difference is obvious. The results of this analysis proved that heat treatments can make a huge difference in scissors’ working life.

Extramarise® Processing
Extramarise® (registered trademark), is a proprietary heat treatment process* ideally suited to haircutting scissors, developed by Mizutani using data and experience accumulated over a period of more than 90 years to balance the three required properties for a good blade: structure, blade angle, and hardness.

Heat Treatment Process
The metals used for edged tools change a great deal depending on the heat treatment used. Proper heat treatment for each material must be carried out in order to fully draw out the properties of rare metals within it, such as cobalt, molybdenum, and vanadium.
Perhaps you’ve heard the term “heat tempering” before. The metals used for scissors don’t initally have sufficient hardness for this use. The stainless steel used in scissors is first heated to over 1000°C, then rapidly cooled to achieve the required hardness. This process is called “hardening.” (For Stellite and other cobalt alloys, different temperatures may be used.) Also, with only hardening, the metals are hard enough, but extremely brittle, so they undergo a “tempering” process to achieve greater durability. For even higher quality edged tools, a further treatment called “sub-zero processing” subjects the metals to a temperature of -100°C or below using materials such as liquid nitrogen in between hardening and tempering to prevent structures that have not completely undergone martensitic transformations (retained austenite) from causing deformations in the course of use (changes occurring over the course of several years).
“Hardening,” “tempering,” and “sub-zero processing” can be combined in an infinite number of ways, and carrying out the ideal combination for high-grade materials to bring out their latent properties to the greatest extent requires an abundance of knowledge and experience. Through the Extramarise® process, developed at Mizutani through analysis of massive volumes of data and experience, we provide metals which leverage the materials of their constituent elements effectively.

The inside of heat treat furnace
The inside of heat treat furnace

We investigated the structure of the SOLID at The University of Tokyo.

Yoshiyuki Ueno, Doctor of Engineering Chiba Institute of Technology, Professor of Department of Design
Dr. Kentaro Asakura, Engineering Department of Materials Engineering at the School of Engineering, The University of Tokyo (Part-time instructor at the Tobu College of Medical Technology)
※BLACK-SMITH® is registered trademark of MIZUTANI SCISSORS in Japan.



By shifting the center of gravity closer to the hand is to prevent wobbling during cutting. And a unique hardening process based on thorough temperature management that brings out the characteristics of the materials. From the result of analysis by the two professors Ergonomics Specialist and Metal Engineering Specialist, SOLID is proved its amazing sharpness and it won’t tire you out.





*LEFTY is available.
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