Gauge: 42 mm bridge: 24 mm shank length: 140 mm grilamid raw material - cr39 lens grilamid natural raw material, produced in switzerland, is resistant to impacts and does not break easily thanks to its flexible structure. it is antibacterial and antiallergic. grilamid natural raw material is sterile and does not form bacteria. it does not contain bisphenol a (bpa). it will not harm your health. it is extra light Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.