8 pcs Basalt stones. Natural Jade Stones: each piece stone made of natural jade stones; the jade stone has great heat retention, perfect for Spa, Massage Therapy. 8 Pieces Small Stones. The curve surface makes the stone joint to your skin closely, avoid the heat waste, little size can be used on feet, face, eyes. These Massage Stones can effectively massage and warmer your muscle, give your body a deep relaxation, improving your blood circulation.