Item Type: Psoas Muscle Release Tool Material: ABS Applicable Parts: L: Hamstrings, thighs, inner thighs, calves, lower back, upper back, triceps, biceps, chest. S: Feet, shoulders, back, legs Effect: The psoas muscle complex (hip flexors) is considered a key part of our body. The psoas major massager regulates our fight or flight response, regulates our breathing, and helps pump blood and lymph through our body Product Size: L: Approx. 41.5 x 14 x 12.5cm / 16.3 x 5.5 x 4.9in S: Approx. 8.5 x 4.5 x 4cm / 3.3 x 1.8 x 1.6in 1Adjustable Design: The attachment head of the psoas massager can be locked into the release board, allowing you to select one of 5 positions on each side, can be customized according to the muscle group you want to release. 2Improve Soreness: Hip flexor release tool helps improve soreness and dysfunction in the hip area, giving you the pressure you want at all times and effectively releasing the body muscle tissue. 3Wide Range Of Applications: Accurate target depth for specific and hard to reach muscles. Psoas muscle release tool is suitable for people of any age and body type. 4Massager Set: Large massager is suitable for hamstrings, thighs, inner thighs, calves, lower back, upper back, triceps, biceps, chest. Small massager is suitable for feet, shoulders, back, legs. 5Multiple Applicable Scenarios: Compact and lightweight, easy to store and carry, suitable for gymnasium, sports training, yoga room, office and home.Please allow slight error due to manual measurement. Thanks for your understanding. 1 x Adjustable Massager 1 x Mini Massager