Product Description: Box Dimensions/cm: 42.5 x 23 x 10 It comes with the following 7 training components: External dimension/㎝ of round one-handed roller: Φ4.2 × 18.5 Short round roller external dimension/㎝: Φ4.2 × 8.5 Flat single-handed cylinder external dimension/㎝: Φ3.2 × 11 External dimensions/㎝ of roller with strap: 14×6×3 Round two-handed roller/㎝: Φ4.2×24 Flat square roller/㎝: 14×3×2.5 Suitable for training wrist muscles and joint mobility.