Made from aluminium alloy and ABS for strength and durability, and with PP rollers to reduce noise while riding. The integrated food stand makes for easy mounting and dismounting while the front wheel bracket is adjustable to fit a wide range of bikes including 26-29 inch, and 700C bikes. Add to this the symmetrical conical bearings to reduce tyre wear and to offer a more realistic riding feel and you have a pair of affordable and durable rollers that will help you work up a sweat! Finally this amazing set of rollers has a telescopic design so it can fold down for easy storage and transport. If you're wanting to ride indoors and still experience a realistic ride feel, then the QBP Foldable Bike Rollers are the perfect indoor training tool for you!