Material: ABS + electronic components_x000D_ Power supply: button battery_x000D_ Diameter: about 5CM_x000D_ Random Colo 1With light color, elasticity and glitter design. 2_x000D_ Bright and powerful, full of vibrant and vibrant colors and designs. 3_x000D_ This repetitive squeezing exercise can promote rest and relaxation, reduce stress, and achieve higher concentration of attention. 4_x000D_ The ergonomic design improves blood circulation in the hands and wrists. 5_x000D_ A great toy. Fun for children and adults.1* Educational toyDue to the different monitor and light effect,the actual color maybe a slight different from the picture color._x000D_ Please allow 1-2cm differs due to manual measurement._x000D_