Handmade from leftover leather from baseball gloves. This is a training tool that can be used at home. It helps you learn how to use your shoulders, elbows, and wrists, and strengthens your inner muscles. Diameter: 10cm Weight: Approximately 30g (individual differences may occur as it is made from leftover leather.) Color: The color of the front and back surfaces are different, but you cannot specify colors. Quantity: Sold and shipped as a set of 2. Shipping: Price includes shipping. Please Note: This product is hand-cut and handmade from leftover baseball glove leather. Please be aware of individual differences in color, texture, and unevenness in the cut surfaces. Thank you for your understanding before placing your order. We do not respond to inquiries about discounts.