Rubbabu is soft, velvety, sensory material made from biodegradable & renewable natural rubber foam! This building block set contains 6 blocks & 7 connector plugs, which will hold the blocks snugly in place. The flocked surface of the squishy blocks provides wonderful sensory stimulation for your little ones. Plus, if baby is more inclined towards knocking over blocks, these won't bonk & hurt their precious noggins, or make much noise! Recommended for ages 12mo