Viper Dart Accessory: Rubber O-Ring Washers for Steel and Soft Tip Darts (2BA and 1/4" Threads, 300 and 1000 Packs) Rubber dart washers, also known as o-rings, are an often overlooked piece of dart equipment, yet they are truly invaluable Washers help prevent the loosening of metal or alloy shafts by tightly securing the shaft against the barrel, improving stability Simply slide a rubber dart washer over the threads on your dart shaft and tighten Compatible with both steel and soft tip darts; An essential accessory for causal and competitive dart players alike Choose either 2BA (3/16") or 1/4" sized rubber o-ring washers; Available in quantities of 300 or 1000 pieces