Set of massage balls in 3 different hardness\'s for acupressure massage and trigger point release. Starting with the softest (least aggressive) ball choose a ball of suitable hardness and position it on the point to be massaged. For the lower back or glutes start in a sittingposition; for calfs or thighs try either sitting or lying on the floor and gently roll around on the ball. For shoulders & upper back place the ball between your back and a wall. For the neck rollthe ball around between your neck and open palm. Use in conjunction with a foam roller for great results!Product details:Dimensions:6cm diameterHardness\'s:Grey - Hard/ Green - Medium/ Blue - Soft.Material:PVC