Features: This meditation balls also known as Baoding balls, relaxation balls and Zen meditation balls, are two little balls that can be held in one hand. While rolling on your hand it can help to relief your stiffness and relax your entire hand just like a finger therapy. Rolling Baoding balls repetitively in the hand can relief your muscle and joint and improve manual dexterity and strength. They also help reduce stress, their use is more focused on stress reduction, relaxation, and strength and dexterity training. In addition to relieving stress, Baoding Balls can improve joints, blood circulation, sleep patterns and memory. Specifications: Item type: exercise ball Material: wiry enamel Types: A, B, C, D, E Diameter : about 4.45cm How to use: When exercising, put two balls in your hand, relying on five fingers flexion and extension, so that the two balls circled with each other. Package includes: 2 x Baoding balls 1 x Storage box Notes: Transition: 1cm=10mm=0.39inch 1. 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. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.