Jade stone has been used for though USA nds of years in China and known for it's cooling properties in revitalizing chi (vital energies) and maintaining body fluid. The use of the jade stone rollers helps improve chi circulation by stimulating the meridian points. GingerChi provide an informational leaflet where customers can follow step-by-step instructions to gentle facial massage to help to reduce wrinkles, replenish the facial muscles and revitalize elasticity of skin. Please note: Due to the nature of the jade stone, known as xiuyan jade, each piece varies in color - from very pale to darker green to opaque and translucent. The stone is hand cut so size will vary. Please take great care when handling the chi roller. The roller is handmade and delicate, we recommend using gentle pressure as skin is also delicate.