Enhance the durability of your arrows with Easton's 4mm Nock Collar. Designed to protect the nock end of your 4mm arrow shafts, these collars help prevent damage from impacts while ensuring a secure and consistent nock fit. FeaturesReinforced Protection: Shields the nock end of your arrows from impact damage.Precision Fit: Designed for 4mm Easton arrow shafts for optimal alignment.Durable Construction: Made to withstand repeated shots for long-lasting performance.Dozen Pack: Includes 12 nock collars for easy replacements.