Product Details: Material: 6AL/4V Titanium Alloy (Gr5) open with allen key inner hex Specification: M5X15/16/18/20/25/30/35/40/45/50/60/70 Weight: about 2.3g/pcs Color: Gold/Rainbow/Silver/blue/Black/Green/Mavue Package include: 4pcs M6x30mm Titanium Bolts