... ,31.6mm Length:350mm, 400mm, 450mm Titanium bicycle MTB seat post Why Titanium? 1.Extended Fatigue Life (frames that last ... a good ductility and easy tobe welded, our frames,seat posts,stems, forks and bar ends are all made ... We use 6AL/4V for some small parts, such as seat clamp and head set. Why Us? 1. Excellent workers 2 ... time 10. Convenient transportation Affordable titanium bicycle MTB seat post