Inner Diameter 6.2mm (.244") Carbon Arrow for Indoor Outdoor Target Practice and Hunting Technical Specification Material: mixed carbon fiber tube Straightness: +/-0.006" Spine: 500 Max Shaft Length: 31inches Outer Diameter: 7.8mm Arrowhead: field point Fletching: 3" streamline turkey feathers, 2 red 1 green Nock: plastic nocks Color: black shaft with red vanes Package: 12pcs carbon arrows "PPP" Features Precision: the strict production process makes these arrows up to the standard of competition arrows, making your archery more accurate and easy. Protective: the reasonable arrow weight can also reduce the energy transfer to the bow while ensuring the maximum initial speed. Purposeful: the combination of accessories makes them perfect for indoor outdoor training and shooting. Personal Customization If you didn't find the option you want, please choose CUSTOM-MADE. Leave us message with the length of arrow you need, we will customize the arrow for you. Note All items are NOT toys, please keep away from kids.