Features: Crafted from hard plastic materials, it have durability and strength, and can bear tension and impact. Suitable for arrow shafts with inner diameter of 6.2mm/0.24inch. Easy installation. Great for targets practice shooting and hunting. Press-in instead of glued type, easy installation and suitable for DIY. Arrow neck feature large and deep grooves that perfectly stabilize the position of the bowstring. Color is bright and can easily found in grass or forests. Specifications: Material: Plastic Color: Redness/Yellow/Green/Black/Whiteness/Clear Redness/Clear Blue Size: about 31.7x7.5mm/1.25x0.29inch Suitable for inner diameter 6.2mm/0.24inch arrow shafts Package Includes: 30pcs Archerys Arrow Nock note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.