Thank you very much for viewing! [Size] Small size Diameter: 2.9 cm (Inner diameter is 2.5 cm, Outer diameter is 2.9 cm) Length: 23 cm Set of 7 cores from commercial-use Kurewrap (cling film) There may be faint water spots or scratches, but please understand. m(_ _)m [Packaging] It will be placed in a cellophane bag and shipped in an envelope. The core itself is a hard and durable core. Since the thickness is at the limit, bubble wrap is not used. [Examples of Use] For handmade crafts and materials... For use in caregiving situations... For use during rehabilitation... It's also a great item for myofascial release.