Give your joints a break in your striking practice with this next generation punching bag. Featuring a longer striking surface and a durable double inner air chamber, this bag also has a free standing design so you can train anywhere with no extra hanging hardware needed! The exterior of the bag is a tough and durable polyester denier. The base can be filled with water or sand, which will give this bag a solid anchor making it hard to knock over so you can train hard. Comes complete with an electric air pump to inflate or deflate the air chambers in less than a minute. Stands approximately 55″ tall (10″ base, 45″ striking surface), with a base diameter of 19″ and a striking surface diameter of 13″.