Description:1， Length: 30 inches (76.2cm)2， diameter: 8cm3， straightness: Linear degrees + / -0.0034， Weight: 38g， with heads 40g5， feathers: 3 inches biomimetic adhesive plastic feather6， arrow: coat head and with aluminum seat / can be replaced (for any Whitworth arrow)7， Aluminum Block: Aluminum inch thread interpolation8， arrow tail: interpolating nockQuality:6pcs This arrow was made of top quality materials .It has good performance ， low hand shock with good speed.NOTE: This is NOT a toy do NOT shoot at people