Thank you for viewing! This item is a sandbag, a tool used in traditional training methods. It's been made smaller for easy training! It can also be modified for wall-mounting or pillar-fixing! The black part is made of rubber and filled with sand to a moderate hardness, allowing for training of punches, back fists, ridge hand strikes, knife hand strikes, backhand strikes, hidden fists, and more! Size changes are also possible. Please consult before purchasing. We also sell other karate equipment, so please take a look! ⚫︎ Product Size ⚫︎ Base board length Length: Approximately 21 cm, Width: 9 cm #Karate #Makiwara (Striking Post) #Sandbag #Chishi (Weight Training Tool) #Sashi (Weight Training Tool) #Training #Shito-ryu #Goju-ryu #Shotokan-ryu #Wado-ryu #Kyokushin #Martial Arts #Core #Training