Ibis Seat Post Clamp The Ibis Seat Binder is resiliently built using forged aluminum and a titanium 5mm bolt. This insanely lightweight binder can be used on the Ibis Mojo SL, Tranny, Mojo HD, Mojo Carbon, Silk, Silk SL, and Hakkalugi frames. Forged aluminum Titanium 5mm bolt Weight: 15g