In order to become a pro at boxing, you need to work on your strikes all the time. The TITLE Boxing Pro Horizontal Speed Ball is one of many training tools you can pick up to work on your striking and defensive skills. This 6-inch bag has a leather head target with accordion resistance bands that attach to any support beam. You can slip under this to work on your defense.
The bands stretch to 12′, so you can set this up almost anywhere. More information is available here.