Features: Make of EPP Foams, this muscle Rollers Foams maintains density and durability, not easy to deform even after repeated use. With its unique designs, this muscle Rollers Foams provide a deep massage that helps you recover faster from workouts and reduce discomfort. Relieve your muscles easily, no matter where you are. Compacts and light weight, easily to carry. This muscle Rollers Foams's multifunctional use helps you achieve your fitness goal by improving core strength, balance, and postures. Ergonomically designs to fit comfortably in your hand, this muscle Rollers Foams have a textured finish that provide great control and precisions. Specifications: Materials: EPP Styles: 30cm/40cm/60cm/90cm 30cm size: about 30x15cm/11.81x5.91inch 40cm size: about 45x15cm/17.72x5.91inch 60cm size: about 60x15cm/23.62x5.91inch 90cm size: about 90x15cm/35.43x5.91inch Package Includes: 1pc Foams Rollers note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.