nullDescription PC lens has a very strong toughness also known as safety glasses The proportion of only 2 grams per cubic centimeter is the lightest materials currently used for lenses Uses Three button helmet can be used wear resistant clear no distortion you can flip up and down Retro helmet excellent configuration lens With three buckle middle Snap fastening snap buttons on both sides there is a channel snap button on both sides can slide slide 3cm around space which means that the lens can fit all helmets with a three button all kinds of half helmet 3 4 helmet Optical index light transmittance UV protection are in line with EU standards JIS standards Specification Size 20 x 21 cmMaterial PC lensColor Brown Silver Transparent Package Included 1 X 3 snap bubble Visor1 X Adjustable Visor Base Attachment