Features:Baoding balls:also known as meditation balls,are two little balls that can be held in one hand. China"s traditional hand sports equipment has a history of thousands of years.Best Gift:Packed in a nice gift box, these baoding balls with so many benefits mean great gift for parents, friends, lovers, and more to encourage them do hand exercise anywhere .Easy to use:When exercising, put two balls in your hand, relying on fingers flexion and extension, so that the two balls circled with each other.High-Quality Material:Electroplate metal balls, smooth surface and hardy structure for durable using.Multiple Benefits:Beneficial to the brain, relaxing brain while playing. Stimulate the circulation of blood and energy throughout the body.Keep your hands, fingers, wrist, and arm healthy. Package Includes:2 x Baoding Balls1x Box(The Color of the Box is Random) Specifications:Color:SilverMaterial: metalSize:Diameter: 3.3cm/1.3in(Type A)Diameter: 3.8cm/1.5in(Type B)Quantity: 1 pair note:If you have big quantity (only need over 50 dollars), please feel free to contact me, I will give you SURPRISED PRICE(The more the quantity, the lower the price), thanks Size For Manual Measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon.And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you