The ForceFlex Ballistic FF120 Safety Glasses uses ForceFlex technology that incorporates a patented multi-injection molding of the lens with a flexible Thermo Plastic Urethane (TPU) Frame. Due to this construction, it achieves a military ballistic level impact resistance at over a 1,000 feet per second. MCR Safety's Professional Grade eyewear is engineered to provide the highest level of innovation for consumers that demand the very best in safety. The TPU material allows the frame to flex and fit individual faces from large to small. All ForceFlex styles meet military VO test regimen for high velocity impact protection and exceed ANSI Z187.1 requirements. Sold by the box of 12.