Safe and soft, these 24 velour-covered, foam blocks are perfect for beginning builders. Easy to stack, their bright colors, and assorted shapes help develop shape and color recognition. And no worries about our littles toppling over and hitting a hard block, as these are soft and gentle. They are also easy to keep clean--simply throw them into the laundry. The largest block is 8" L. x 3" W. x 4" H.