October Mountain Retna Peep Sight Black. The aperture design provides a clear round sight picture even when slightly misaligned. Available in three standard sizes. Specifications for October Mountain Retna Peep Sight: Manufacturer: October Mountain Color: Black Features of October Mountain Retna Peep Sight: Made from 6000 series aluminum Features deep wall string and serving groves Clear round aperture that forgives peep misalignment Package Contents: October Mountain Retna Peep Sight October Mountain 1601201: Retna Peep Sight Black