These fasteners are machined from forged 6AL-4V (Grade 5) Titanium alloy rod. They feature a 60 degree tapered conical seat compatible with most OEM and aftermarket wheels. The threads are rolled, not machined, for superior strength and wear resistance. Grade 5 Titanium has 94% the yield strength of a metric Grade 10.9 steel fastener and is over 43% lighter.
Picture shows weight comparison of 16 bolts: steel lug bolts (2lb, 9.9oz), and Radium Ti bolts (1lb 7.9oz).