Gaiam 07-70573 SPRI Hot/Cold Therapy Balls deliver gentle, controlled tension release to hard-working muscles in the back, shoulders, gluten and feet. 2 Therapy balls - 1 smooth, one textured - are filled with a unique compound that enables them to safely retain both heat and cold. You control the temperature, motion and level of pressure for a fully customization muscle massage. Use pre-workout to activate the body, increase circulation, and enhance muscle readiness. Use post-workout to reduce soreness, stretch muscles and restore body alignment. Features: -Set includes 2 therapy balls.-Filled with a unique compound that enables them to safely retain both heat and cold.-Pre-workout to activate the body, increase circulation and enhance muscle readiness.-Post-workout to reduce soreness, stretch muscles and restore body alignment.-Product Type: Massage ball.-Primary Material: Plastic -Primary Material Details: ..-Number of Items Included: 1.-Pieces Included: .-Water Resistant: No -Water Resistant Details: ..-Remote Control Included: No.-Health Benefit: Rehabilitation.-Adjustable: Yes.-Bath/Shower Compatible: No.-Foldable: No.-Portable: No.-Hand-Held: Yes.-Area of Focus: Arms and hands; Legs and feet.-Therapy Type: Heat.Dimensions: -Wheels: No -Wheel Height - Top to Bottom: .-Wheel Width - Side to Side: ..-Cord Length: .-Overall Product Weight: 0.5.