Black Eagle PS25 Nock Bushing Standard Nock 12 pk. Made from durable 7076-T6 aluminum alloy;Engineered to fit PS25 shafts precisely;Manufactured to the tightest tolerances for consistent performance;Standard Nock Bushing: 16 grains/G/M Nock Bushing: 17 grains/Pin Bushing: 15 grains;Includes 12 bushings per packtable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 1100 Product Group Code: 1100C Product Sub Group 1: 1100C1 Inactive: No