200 Pieces dart shaft o-rings rubber dart washer rings non-slip dart rod ring to Keep Shafts Tight Feature: Necessary equipment: Our dart washer rings can effectively prevent the dart shaft from loosing, dropping or bouncing, they could provide your a smooth and steady flight path, increase the accuracy of hits. Practical to apply: Our rubber dart shaft o-rings are flexible and durable to use, can work for most standard dart shafts, bring you a fun and thoughtful playing experience. Specification: Material: rubber Size: approx. 3/16 inches/ 0.47 cm in diameter Color: black Package include: 200 x Dart shaft o-rings Note: Small and inedible items, please keep away from little kids to avoid accidental ingestion. Manual measurement, please allow slight errors on size.