Each block has a different number and color to help develop early motor skills and the unique colors promote visual, sensory discovery. The blocks will teach numbers, colors, shapes, and buoyancy! Each block and its corresponding sides are assigned a number 1-4 to assist with counting. These waterproof stacking plastic blocks float and squirt water for endless playtime fun! Fill the blocks up with water and stack them for playtime or use them to squirt water. These lightweight blocks are the perfect size for small hands and are made of soft plastic for safe bath time play! EASY TO CLEAN: The plastic surface is easy to clean, simply use a soft damp cloth and mild soap to sanitize. Take your blocks to the kiddie pool or playroom for extra fun. Perfect unisex toy for infants 6 +months.