This professional Opal London Ergoform Bodycare Exercise Massager uses a supple rubber pad embedded with polished wooden pins designed to provide a stimulating muscle fatigue or anti-cellulite massage which penetrates deep into the dermis without scratching the skin. Perfect for post-exercise muscle massage, to reduce the build-up of lactic acid, which can cause cramp. Pay particular attention to massaging inner knees & upper thighs whilst muscles are warm, to stimulate circulation & help reduce the build-up of toxins. Opal London pursue a policy of non animal testing & sustainable resourcing.