PYROTECT Racing Optics Tear Offs (.004) are a stack of 3 laminated tearoffs that are 4 mil thick. The laminated technology creates a distortion-free optical lens. and used in open or formula cars to prevent oil and dirt accumulation. Our special clear optical material eliminates the "rainbow" effect. is a stack of 7 laminated tearoffs that are 2 mil thick each. The laminated technology creates a distortion-free optical lens. Will fit all PYROTECT & BELL shields.