Aluminum front triangle with carbon rear triangle, featuring 135mm QR and 142mm through-axle options. The seat post is 31.6mm diameter and the bottom bracket is threaded. Included in the sale price is a Chris King headset, which is in very good, if not excellent condition. The frame has one small nick at the top tube/seat tube junction and there are small scratches inside the rear triangle from trail debris, but nothing that goes deep enough to touch the carbon. Seller will only accept an offer and ship to a buyer from inside the continental U.S. Payment must be made via PayPal. Please email me at jaredbadams@live.com if you have any questions.