CST – Center String Technology – PXL Capture Aperture located on center of bowstring – no L and R misses. OCT – Optical Centered Technology – Improved centration of lenses for ultimate accuracy. PLT – Protected Lens Technology – Lenses protected by plastic on 2 sides prevents cracking. DSAT – Dual String Angle Technology – has both 37 and 45-degree string angles on the same peep housing. TAP – Tool-less Aperture Technology – Knurled Tool-less PXL Capture Aperture – eliminates the need for an aperture wrench. PXL Clarifier or Verifier lenses can be removed from the Capture Aperture for easy cleaning. Additional “PXL Hunter Peep Shade Cap” accessory – screws into front of peep to prevent glare. NOTE: PXL Hunter Peep Apertures fit into Specialty Archery PXL Hunter Peep ONLY. NOT compatible with other Specialty Archery peeps.