Thank you for viewing my listing. My child used this for only two months before quitting, so I'm offering it for sale. It was handmade, so there may be some fraying. The opening is large, so I think it will be easy for children to use ^ ^ Size: Fits up to 18.5 (likely referring to a measurement, e.g., cm) How about using it for rhythmic gymnastics or a children's rubber ball bag? Please understand that this is a used item before purchasing. I think it's clean without any stains, but please refrain from purchasing if you are sensitive to such things.