Thank you for viewing! Thanks to you, many customers have purchased our products, and we have a track record of high ratings. We are proud that our rubber is the most affordable and has the highest holding power! The photo shows the KUN rubber after replacing the deteriorated one. Photo 5 We also have black rubber from Bon Musica (Germany), so please comment if you're interested. The tubes are made of American rubber (raw rubber). Sold in sets of 4. If you want multiple sets, please let us know in the comments before purchasing. This product is for 4/4 size. It's for replacing the claw rubber of the old KUN type, but repeat customers have informed us that it can also be used for 3/4 size. (Not an official product) *Uncertain if there is an official product We do not know if it fits other fractional sizes or shoulder rests from other manufacturers. If the rubber deteriorates, your valuable violin could slip and fall, so we recommend replacing it early. It's slightly long or cut to the exact size, so cut off any excess with scissors. We will ship via regular mail, but we are not responsible for any postal accidents. (Regular mail does not deliver on weekends and holidays) Due to Japan Post's circumstances.