The most advanced peep system in the archery industry, completely designed for ultimate accuracy. TAP Tool-less Aperture Technology Knurled Tool-less aperture eliminates the need for an aperture wrench. CST Center String Technology Aperture located on center of bowstring no L and R misses. PLT Protected Lens Technology Lenses protected by plastic on 2 sides prevents cracking. Podium Peep allows for easy removal of Clarifiers and Verifiers for cleaning.