Measure: about 0.08 inches/ 2 mm for inner diameter, 0.157 inches/ 4 mm for outer diameter, 0.04 inches/ 1 mm in thickness, suitable for 2BA threaded aluminum or metal shafts, fits most darts.
Made of quality rubber which is flexible to use, durable and not easy to break or wear.
Securely keeping the shaft of dart in tight and making the dart set firmly installed, they can prevent the shaft from falling off easily.
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