ACCU-STRIKE SERIES - BONE COLLECTOR EDITION.  4 pin019 pin size.  Black finish.  Lightweight/compact, all-metal constructed design w/Tru-Touch soft-feel technical coating.  Tru-Flo fiber design provides brighter pins.  easy access to the fibers for replacement.  Super long fibers routed through bracket for increased durability.  exposure to UV light.  Includes Micro Push-Button Light.  Aperture has 1.8 inner diameter.  Glow-in-the-dark shooters ring.  Adjustable for RHLHshooters.  Reversible bracket for greater vertical adjustability.  NOTE: Bone Collector Edition features black finish, logo.  patented DDP Technology (Decreasing Diameter Pin) for more precise pin placement.  more accurate aiming at longer distances.