Markus Twain introduced a super easy to put on ball stretcher; the Slide In. It has weight of almost 10 ounces and has an ergonomic new design style. Simply slide your ball sack through and close it with the end piece. If pushing your balls through standard ball stretchers hurts, you should definitely try this one!
It is made out of stainless steel and weighs about 10 ounches / 300 gram