Olight Filter's outside use high quality TPU, It is Flexibility, Wearable,Chemical resistance and Abrasion resistance. It can be used for the flashlights whose size has a little different. Lens use coating glass, which is better for the light pass through than plastic. It is very good when hunting.
FEATURES : Olight Filters and Diffusers outside use a high quality TPU body construction which offers flexibility, durability, chemical and abrasion resistance Lense of the Olight filters are made of ground glass Top quality Anti-Reflective coating on BOTH SIDES for optimum light transmission	SPECIFICATIONS : Inside Diameter :  21.4mm~21.7mm/ 0.84"~0.85" Outside Diameter :  29mm/1.14" Length :  18.8mm/0.74"