XStack Tear Offs for Pyrotect, Bell Vortex, M4, K-1, BR-1 - 10205C by Racing Optics comes with patented laminated tearoff technology. Being 2 mil thick, this 10-layer tearoff stack suits all dirt racing applications. Each sleeve offers 3 stacks of 10 tearoffs, allowing for a total of 30 tearoffs per sleeve. The optical grade Mylar tearoffs, laminated into stacks, enhance visibility by reducing reflected light and increasing light transmission between layers. The Part Number provided by the manufacturer is 10205C. The packaging includes 10 clear 2 mil laminated tearoffs. This model can perfectly fit Pyrotect (SA2015 & SA2020), Bell Vortex, M4, K-1, and BR-1.