Check the listing for details. FIRENOCK Extreme Matched Weight Practice Nock + End Cap for Q3 (PQx). Condition: New. Listed at 19.95 USD. Brand New FIRENOCK Extreme Matched Weight Practice Nock + End Cap for Q3 (PQx) Custom accessory for Firenock " Q3 " lighted nock pack With installation of Extreme Matched Weight, your Practice Nock will be able to shoot into hard objects: cinder blocks, rocks and most dried out hard wood without being destroyed. Contents:3 "Q" style nock in green3 Extreme matched weights3 Extreme shock end caps3 O-rings for end caps1 Installation tool Notes: Gel type super glue (e.g. Firenock AGOGEL, sold separately) is needed to successfully install Extreme Shock Battery End CapClean arrow shaft with acetone before installation of End CapPut glue into the cleaned arrow shaft (do not put glue on End Cap / Tool)Push End Cap with tool straight (do not rotate) into the arrow shaft during installation of End Cap