The Mongoose 26" x 4" Fat Tire Tube is made with thick rubber that holds air well so you can get back on the trail quickly. Compatible with 26" x 4" fat bike tires, this Mongoose bike tube has a standard Schrader valve for easy inflation. The Mongoose 26" x 4" Fat Tire Tube is easy to install.Manufacturer model #: MG78253-6. Thick rubber holds air well Standard Schrader valve Fits 26" x 4" fat tires Easy to install