Wiel B115 New Carbon Mountain Bike Frame 26er MTB Frameset - 3k Red Black 17&rdquo;/19&rdquo; Our Bicycle Frame were made mainly with Toray T700 carbon fiber. Technologically superior monocoque frame building processes and thick-wall, high vacuum forming machines allow we can control over the shape and the ability to make a better rigidity and strength. EPS core mold and air bag's cost is lower than others. Air bag outside the EPS core mold can working as airproofing, and avoid the EPS toughing carbon fiber. It's easy to take it out after molding. Headsetup 1-1/8down 1-1/2 BB TypeBSA BB