The size is 18cm. The item has been home-cleaned prior to listing. Please check the photos for slight peeling on the toe area and the back of the Velcro straps. Also, there are some stains that won't come off, minor scratches, scuffs, and signs of use, but I think it can still be used without any problems. When shipping, I plan to use simple packaging and will send it via post to keep shipping costs down. Please be aware of this before purchasing.