Features: new and high quality Achieve accurate arrow placement with these plastic pin nock. Perfect for arrow shafts, they ensure a secure fitting. Crafted from PC materials, these pin nock being quality and safety to use. Offering consistent flight, they being perfect for hunting and targets practice. Suitable for almost skill height, these pin nock provide a wonderful hunting experience. Specifications: Materials: PC Package Weight: about.15g Color Options: 9 Color is Available as Show in the Picture. Type: 17.7mm/18.7mm (Optional) Size: about.18.7mm/0.73in Package Includes: 20Pcs Arrow Tail note: Please allow 1-3mm error due to manual measurement. Please make sures you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual colorful of the item. Thanks!