Kreitler Kompact Challenger Rollers with Alloy Drums and Poly End Caps 100-Percent Made in the USA Available in various drum diameters (3.0-Inch, 2.25-Inch) and all are 15-Inch wide Includes belt and Kompact Frame which is designed for bicycles with 38 to 42-Inch wheelbases; Designed for maximum portability and lighter weight