specification: _x000D_Item Type: Bone Correction Massager Adapter _x000D_Material: Stainless Steel _x000D_Diameter: Approx. 11mm / 0.4in Features: 1Single pressure physiotherapy head: suitable for relieving the pressure of single deep tendon. 2Silicone adapter: used to connect non-metallic massage head. Designed for bone setting correction massager. 3T type physiotherapy head: suitable for slow pressure of medium muscle bundle and tendons. 4Small U physiotherapy head: suitable for slow pressure of cervical spine through the two sides of the tendon. 5Large U physiotherapy head: suitable for slow pressure of the lumbar spine through the two sides of the tendon. PackageList: 1 x Single Pressure Head1 x Silicone Adapter1 x T Type Head1 x Small U Head1 x Large U Head