Features： 1、Scope Of Application: Works with most muscle massager. The outer diameter of the massage head is about 19mm / 0.73in, suitable for muscle massager with inner diameter of about 18.5mm / 0.73in. 2、Multiple Massage Head: Different massage heads are suitable for different parts and muscle groups, can be replaced as needed. Match with muscle massager (not included), uses scientific vibration frequency to activate muscles. 3、Muscle Relax: 5 types of replaceable heads, effectively relax body muscles, relieve fatigue, increase blood flow, greatly reduce muscle recovery time and relieve soreness. 4、EVA Material: Massage head is made of EVA material, which has shock absorption effect. Safe and odorless, can be in direct contact with the skin and can be washed directly with water. 5、Portable Design: Light weight, small size, easy to install on the deep tissue massager, easy to store and carry, suitable for home use and massage shop. Specification： Item Type: Muscle Massager Head Material: EVA Quantity: 5pcs (small ball head, black curved head, T shaped head, U shaped head, projectile head) Caliber: Approx. 19mm / 0.7in Applicable parts of each massage head: Ball head: suitable for large muscles such as buttocks, thighs, calves, etc., to relax soft tissues and sensitive muscle groups. U shaped head: used for the spine, the head and the Achilles tendon. T shaped head: Massage the large flat muscles of the lower back, relax the yourself, and shape every muscle. Projectile head: Impact deep tissues, such as meridians, acupuncture points, etc. Deep relaxation, shape every muscle in your body. Curved head: suitable for neck and calf Package List： 1 x Small Ball Head 1 x T Shaped Head 1 x U Shaped Head 1 x Projectile Head 1 x Curved Head