20” Crystal Clearz are exactly that – clear poly balloons that are designed with a self-sealing valve. Crystal Clearz are pre-stretched and easy to inflate up to between 18” and 22″ inches using a latex regulator. Clearz contain no latex, are transparent, inflate like a ball, and can be inflated with helium (lasting 24-48 hours) or air. Great for organic balloon decor, accent pieces and more.