Specification: Product Name: Body Massager Roller Ball Base material: polypropylene Ball material: stainless steel metal Color: Random Weight: about 154g Size: base diameter 6.5cm/2.56", height 6cm/2.36", ball diameter 5.4cm/2.13" Function: Used for acupoint massage, essential oil kneading, a great massage aid tool, relax muscles, improve facial contours