Here is a flexible band with PVC plastic spring hooks that helps you work on slipping, weaving, and bobbing. You can attach it to boxing ring corner posts, support poles, and even door knobs to start training. The Title Boxing 3-in-1 Resistance Band Slip Cord comes with an adjustable 4-inch foam rubber ball.
This resistance band is 340 inches long when stretched. You can find out more about it here.