Description Using scientific vibration frequency and amplitude, the massage head can activate the muscles, increase blood flow. The standard ball is suitable for small muscle groups, the large ball is suitable for large muscle groups. Relax your muscles anytime and anywhere to relieve fatigue. Environmentally friendly, tasteless material. Small size, light weight. Convenient to use and carry. Easy to clean. Durable and practical. Massager Attachment Material: EVA+metal colour:Black Package Contents: 6 x Massage head 2 x Extension rod Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.