Product Details: Material: 6AL/4V Titanium Alloy (Gr5) open with allen key inner hex Specification: M5 x15/16//18/20/25/30/35/40/45/50/55/60/65/70/80mm Weight: about 2.3g/pcs Color: God/Rainbow/Silver/Blue/Black/Green/Mavue Package include: 4pcs Titanium Bolts