Engineered to deliver a customized, deep-tissue massage, the Pro-Tec Hollow Core High-Density Foam Roller features a flat surface that enables a smooth, fast roll and a 5.5"W x 13"L size that lets you target large and small muscle groups. The elastomer outer layer with 1" foam padding provides a firm surface for aggressive myofascial release, while the polypropylene tube with a hollow core promotes durability. Exercise guide included.