Outter diameter : 8.8mm Inner diameter : 7.6mm Material of arrow shaft : pure carbon Length of arrow shaft :20 Inch Weight of arrow point (broadheads only) : 125 grain Weight:about 37.5/ Pcs Arrow nock : halfmoon shape Arrow vane : 4" vanes , two blue one green with aluminium insert for screwing the arrow tips Usage : for crossbow hunting or archery