Specialty Archery PXS Target Peep Black. Center String Technology ? PXS Capture Aperture Specifications for Specialty Archery PXS Target Peep: Manufacturer: Specialty Archery Color: Black Features of Specialty Archery PXS Target Peep: Center String Technology Optical Centered Technology Protected Lens Technology Dual String Angle Technology Tool-less Aperture Technology Package Contents: Specialty Archery PXS Target Peep Specialty Archery PXSBLK: PXS Target Peep Black