This is a caster cover for suitcases, size S. Size S I purchased this on Amazon, but it was a little too small for my suitcase, so I'm selling it. I tried to attach one to my suitcase, but it didn't fit, so I haven't used the others. Therefore, it's almost new. Caster diameter: φ4.2cm ~ φ5.2cm Tire width: up to 1.5cm The following is from the Amazon website regarding the fit: [Size S Fit] Caster size diameter 4.2cm ~ 4.9cm / ◎ It takes a little effort to install, but it's a perfect fit. Once you get the hang of it, you can install it easily. It's also easy to remove. Please use this information as a reference. Please understand that this item has been in the possession of an individual, and that it is a used item. Please also read my profile before making a purchase.