Here's how to get more bounce from a normal tennis ball - buddy it up with a heavier ball for twice the impact. Hold a ball in each hand and decide which ball weighs more (has greater mass).

Scott Miller, Founder & CEO of PICKLETILE™, created PICKLEGLASS™ Soundproof Systems, an innovative sports design solution.

Shaking the can agitates the pea, causing it to bounce around the inside ... The rattling noise is a result of the metal ball inside the can, which is necessary for effective mixing.