It can relieve stress, pain, muscle tension and increase blood circulation; It helps to relieve tension, stiffness, insomnia, and fatigue; It is helpful to make you relax. Features: Color: orange, blue, green, red, yellow Material: sponge,ABS Nature: small and easy to carry; powerful and not hot; good elasticity; flexible Function: through the acupression to make the body blood flow unimpeded. Notes: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 1-3cm measuring deviation due to manual measurement.