Double Set of Med-Block/Stackable Medicine Balls 6,8,10lbMed Blocks Square Balls Stackable Medicine Balls Square Ballsare part of IRONWEARs Med Blocks product line. The unique patented design permits them to act like a medicine ball but stack like blocks. The soft shell and corners let you throw and catch them like a ball. The padded handles make it easy to hold, swing and lift for all kinds of exercises. Square Ballsare soft but heavy. The weight comes from soft recycled rubber, so they are soft all the