Check the listing for details. Racing Optics XStack Tearoffs, 10210C, 13" Post Spacing (3 STACKS, 10 LAYERS). Color: Clear, Condition: New. Listed at 33.99 USD. Racing Optics XStack Tearoffs, 10210C, 13" Post Spacing (3 STACKS, 10 LAYERS) Description Racing Optics X Stack Laminated Tearoff System represents the latest and best product introduction to date from Racing Optics, the leader in motorsports laminated tearoffs. The laminated technology creates a distortion-free optical lens. The X Stack Laminated Tearoff System provides the following Features: 10 Layers thick for long races, 3 more per stack than the Speed Stack 7 system Better visibility than any other laminated tearoff system available The worlds BEST tearoffs More layers Better visibilityEach package of Racing Optics X Stack Laminated Tearoffs includes 3 stacks of 10 tearoffs for total of 30 tearoffs per package.