This listing is for the edge pieces only, for 30x30cm joint mats. There are two types: corner pieces and connecting pieces. 85 corner pieces 109 connecting pieces These mats are excellent for soundproofing, shock absorption, floor protection, and water resistance. Because I'm selling a large quantity, they could be used for children's arts and crafts. Due to their high cushioning properties, they are also ideal for children to handle. They are new and unused, so I couldn't bear to throw them away. I'm listing them. Color unevenness is original to the product. They have not been exposed to sunlight. Although they are new and unused, they have been stored at home. Please understand this before purchasing.