Scott Sports Works Hustle/Tyrant Tear Offs ProStack Kit,  (Pack of 3) Tear-offs help maintain visibility and control in dirtiest conditions Prostacks are a laminated tear-off system designed to be used exclusively on the Works lenses Lamination of the Tear-offs effectively eliminates refraction of light between individual Tear-offs, resulting in a crystal clear view of the track, even with multiple prostack prepacks mounted on the lens Prostack tear-off come 3 to a laminated prepack and there are 3 prepacks per package - Works pins and post included Compatible with all Hustle/Tyrant Series Works lenses