“kiefer water exercising discs are built of soft and buoyant most desirable quality foam. They feature a secure grip and provide underwater resistance. Perfect for aquatic workout, aqua aerobics, or aquatic therapy. Easy grip commencing may be used with or without the thumb hollow. Those exercise discs are a top notch desire for the ones who’ve trouble with a hand bar style grip. Kiefer – the primary call in u. S. Swimming on account that 1947.