The Chirp Wheel XR Neck Roller Massager is ideal for relaxing tight muscles and easing everyday tension. Its shaped massage nodes work into the muscles at the base of your skull to help release stiffness. The Spinal Canal groove reduces pressure on your spine, so rolling feels more comfortable. The 4" wheel fits naturally around your neck, making it easier to target tight spots and helping to support better posture and mobility.Rigid core - stays firm for consistent pressure Lightweight 250 g designSupports up to 227 kg