Valve material: Medical grade silicone

What's included: Boostinator kits consist of a specially-designed axle end cap

The crystals inside the sealant also help to plug larger holes

the Version 4

Resin-Organic: Non-Finned: (Disc C compound) made from a Kevlar

E-Thirteen TRS Race 6 Bolt Front Hub - Black - 15x110mm Boost - 6 Bolt - Front - 32 Hole Images Uploaded - Ready for Review Valve material: Medical grade siliconeFull alloy construction that's lighter than the previous carbon shelled versions, the E Thirteen TRS Race hubs feature large, widely spaced flanges for the stiffest and strongest wheel build possible. Who's this item for: Mountain bikers! This will work a treat on any bike from an XC whippet to an all out gravity bike. Materials: Full alloy construction. Convertibility: Includes standard 15mm end caps and 15mm Torque Caps to suit Rockshox forks.