Outter diameter : 8.8mm Inner diameter : 7.6mm Material of arrow shaft : mixed carbon Length of arrow shaft : 17"or 20" or 22" Weight of arrow point (broadheads only ) : /85 grain or 125 grain Weight:about 25g/pc Arrow nock : halfmoon shape Arrow vane : 4" vanes , two blue one white With aluminium insert for screwing the arrow tips Usage : for crossbow hunting or archery Packing :12pcs The feather is plastic，in the course of transport, there may be wrinkles, bending. If you in such cases，sorry for the matter. But dear , it is very easy to solve the problem , Please prepare some hot water , and then the the fletch in it , after 3 minutes , you will get a good fletch. Hope i can help you,any probelm,please contact me in the first.