Thank you for viewing! This is a set of 7 pairs of kids' socks featuring designs of fire trucks and police vehicles. There are two sets of 3-pair socks. The small tabs (or something similar) on these socks make them easy to put on and take off. My child loves this series of socks and I always stocked up on them, but they outgrew them before they could be used. I'm not sure of the size of the 3-pair sets, but I think they are about the same size as the single gray sock (14-19cm). If you confirm your purchase and would like me to remove the plastic fasteners that hold the 3-pair sets together for shipping, I will deduct 100 yen for shipping costs, so please let me know.