The Big Boppers are meant to be a bunch of things. First, you can wail away on each other and nobody gets hurt. 2nd, they really work as a blocking tool. 3rd, they make a perfect kicking target, and punching target- much like focus mitts, or Thai pads.
These have 1" of high density foam, and a hollow 3/4" CPVC core-light, but very sturdy!
The handles are 3/4" w/ 1" pad on the butt. For more aggressive sparring, choose the 1" thick w/ 1 1/2" pad on the butt.
You can add a Nylon core for more weight...a bit of realism!