Item Type: Hot Stone Material: Basalt Quantity: 4pcs round hot stones: Approx. 8 x 8cm / 3.1 x 3.1in 4pcs oval hot stones: Approx.8 x 6cm / 3.1 x 2.4in 8pcs oval hot stones: Approx.3 x 4cm / 1.2 x 1.6in 1pcs mushroom shaped stone: Approx.4 x 6cm / 1.6 x 2.4in Package List 4 x Round Hot Stones 8cm 4 x Oval Hot Stones 8 x 6cm 8 x Oval Hot Stones 3 x 4cm 1 x Mushroom Shaped Hot Stone Please allow slight error due to manual measurement. Thanks for your understanding. 1Therapeutic Relief: This massage stone can improve pain from sprains and strains, relieve stress, and relieve muscle tension, soreness and stiffness. 2Fast Waterless Heating: Can be quickly heated in just 10 minutes, bring you convenience. Promote blood circulation and metabolism, make you feel comfortable. 3Basalt Material: This hot stone massage set features smooth black basalt with high silicon and iron content to keep warm for 2535 minutes, longer than most stones. 4Multiple Applicable Part: Multiple massage stone are available, with different size and shape, suitable for massaging neck, back, shoulders, arms, legs and many other parts. 5Safe To Use: Mellow corner, will not scratch skin, can be used with confidence. Safe and eco friendly, firm and sturdy, no deformation, stable and durable.