Check the listing for details. Surefire Z44 Head Replacement Lens UCL, Optical Coated. 6P 9P C2 C3 Z2 D2 D3 G2Z. Condition: New. Listed at 8.50 USD. Tempered Ultra Clear (UCL) Glass Lens with Multi-Layered Optical Coating for the Surefire Z44 Head Unit. This is a top quality product that will significantly upgrade your lights that use the Surefire Z44 Head Unit.Dimension: 28.5 x 3.4mmThis is the closest to the original lens and is a direct replacement.No need to add or change the O-ring gasket on the stock Z44 head unlike what all the other sellers have.Highest grade UCL Ultra Clear Lens with 99% light transmittance that significantly improve optical efficiency and increases light output. This tempered glass lens is way more durable and way tougher than the stock lens. It can withstand a much higher temperature than the original lens, not to mention improved scratch resistance.We applied the highest camera lens quality multi-layered optical coating on both sides to further improve the lens.This is a must have upgrade for all users of Surefire lights and setups with the popular Z44 Head Unit. Compatible with:Surefire6P, 9P (with Z44 Head Units that has the removable bezel ring)C2, C3 (with Z44 Head Units that has the removable bezel ring)Z2, Z3 (with Z44 Head Units that has the removable bezel ring)D2, D3 (with Z44 Head Units that has the removable bezel ring)G2Z ***This lens is NOT compatible with older generation 3P, 6P, 9P, D2, D3, Z2, Z3 lights that use the press fit Lexan poly-carbonate lens as shown on the 2nd photo.******This lens is made for the Surefire Z44 Head Unit ONLY. It will NOT fit any other Surefire flashlights such as the G2, G3, etc.*** Surefire G2 and G3 Replacement Lens also available: https://www.ebay.com/itm/222503608243