Thank you for viewing! This product is a sandbag wall-mounted type, a tool for traditional training methods. It also comes with a hook. It's been made small for easy training! The black part is made of rubber, and sand is filled to a moderate hardness, allowing for training of fists, back fists, wrist strikes, knife hands, backhand strikes, hidden fists, and more. Size changes are also possible. Please consult before purchasing. Product Size: Base board length: Approximately 24 cm (length) x 9 cm (width)