These are similar to leather stretcher but they incorporate lead shot packed into the stitched compartments so these do generate a downward pressure to create stretch. They are more difficult to lubricate, so not as effective in creating stretch as steel, but they do have strong erotic appeal and combine that lovely kinky attraction of black leather with the sexual hunger inducing sensation of weight on the testicles.

As with leather thought needs to be given to the effect of sweat and condideration given to lubrication. Talcum powder can be used but some people's bodies will turn this into a kind of grinding paste when combined with sweat. Individuals need to experiment to find what is right for them.