Feature:1. Hard and dense rock, having longer insulation time, durable to use.2. Manual grinding, natural material and heathy to use, natural massage stone.3. Multi-function, eliminate toxin, dredge channels and collaterals.4. Improve blood pressure, reduce joint pain, better care for your health.5. Including 16pcs of the package, meeting your different needs.Specification:Condition: 100% Brand NewItem Type: Massage StoneQuantity: 16pcs / box Size: Approx. 8 x 8cm / 3.1 x 3.1in (4pcs), 6 x 5cm / 2.4 x 2in (4pcs), 3 x 4cm / 1.2 x 1.6in (8pcs)Package List:16 x Massage StoneNote:(1) For the first use, it is recommended to boil directly in water for disinfection;(2) Take out the towel after heating to avoid burns. Wrap the towel with hot compress. Remove the towel when it falls to the acceptable temperature of human body.(3) Generally, it can be heated for 7-8 minutes without covering the quilt, and the thermal insulation time can be extended if covered with the quilt;(4) The duration of hot compress is affected by heating temperature, weather and room temperature, etc. It is a normal phenomenon that the duration of hot compress is shorter in cold regions.(5) Do not touch cold water or take a bath within half an hour after hot compress, drink more warm water (not cold water or ice water);Do not apply hot compress within an hour after a meal.(6) Please allow 1-3cm error due to manual measurement. Thanks for your understanding.(7) Color, uneven surface air hole, there are white lines are formed naturally, please purchase carefully if you mind it.