This is a set of 8 Baby Park sponge blocks. They are made of firm sponge. The set being sold includes 2 blocks of each of the 4 colors. If you have more blocks, you can combine activities involving color, quantity, and actions, such as "collect 3 yellow blocks," "line up 5 blue blocks horizontally," or "stack 4 red blocks." This set is also recommended as an addition for those who already own some. Each block is approximately 4cm x 4cm in size. These are new and unused, but have been stored at home, so we ask for your understanding when purchasing. As the box size is tight, they will be shipped in a waterproof bag, not bubble wrap. TOEZ Baby Park - Colors: Blue, Green, Yellow, Pink - Material: Sponge - Shape: Block - Use: Educational Toy Thank you for looking.