XStack Tear Offs for Impact, Simpson Shark, Vudo, Invader, Sting Ray, Devil Ray - 10209C is a Racing Optics helmet system with patented laminated tearoff technology. With a 2 mil thickness and 10-layer tearoff stack, this product is ideal for all dirt racing applications. Each sleeve contains 3 stacks of 10 tearoffs, totaling 30 tearoffs per sleeve. The use of optical grade Mylar tearoffs laminated into stacks results in increased visibility by reducing reflected light between layers. The Manufacturer Part Number of the product is 10209C and it includes ten clear, 2 mil laminated tearoffs. This model is compatible with Simpson Shark Super Shark, VUDO, Invader, Valor, Sting Ray, Devil Ray, Desert Devil, Impact 1320, Impact Air Draft Super Sport, Spider Wizard, and Euro Sport.