TRNR's trigger balls are a set of two large and small 6.5 cm and 4.5 cm. It is palm-sized and easy to carry, making it ideal for lymphatic massage and Pilates. It helps with stretching, myofascial release, and shoulder stiffness. Made of hard silicone, it achieves an acupressure effect that can be approached deep and can be expected to improve stiffness. It is suitable for various parts of the body, such as hands, neck, hips, and soles, and is recommended for those who work from home or lack exercise. It's lightweight and durable, and it holds trigger points by rocking your body and applying vibrations. It is the perfect item for those who want to relax.