Gorilla Gym Speed Bag Platform Includes the speed bag & fight station: plugs right into your Gorilla Gym fight station and core Gorilla Gym doorway unit This Speed Bag is easy to attach and use in your home with the Gorilla Gym core doorway unit Helps improve hand-eye coordination and offers a great workout with low impact No drilling, no holes, no bolts, no marks on your doorway or door trim when used with a Gorilla Gym doorway unit. Some assembly required Part of the Gorilla Gym family of plug and play accessories; cannot be attached without the core Gorilla Gym doorway unit