This Sharonelle Professional Muslin Epilating Roll is a 100-yard length of natural woven cotton cloth sold as a bulk strip roll for soft-wax hair removal, used by estheticians to cut their own strip lengths rather than working from pre-cut sheets.
Muslin cloth has enough tensile strength to be pressed onto wax, pulled against the direction of hair growth, and reused a couple of times within the same treatment area before it needs replacing, which is different from a single-use non-woven wax strip. It's suited to strip/soft wax applied on larger body areas such as legs, arms, and the back.
Sold as a full roll rather than pre-cut strips, so length is cut to match each treatment area during the service.