The Parachute Ball Stretcher is definitely an adventurous piece. The Parachute is made out of soft leather for comfort as well as strength. This encloses your boys and is fully adjustable for your needs. The metal rings that hang below the parachute can be tugged on gently for stimulation or can be use in stretching by adding weights.
Here is a link to some weights that would work awesome with this piece Large Heavy Weight