Want to work on your lower back? Bigger framed person? RAD's got what you’re looking for. The RAD Roller XL is around 30% bigger to accommodate larger athletes and to provide a stable base for the lumbar spine. Built strong in solid, pure silicone. Use with the RAD BLOCK for additional leverage and stability. Dimensions: 5.6" x 2.8". Materials: Silicone, Latex Free. Color: BLUE. Unit weight: 17 oz. Comes with PDF guide of exercises