Thank you for viewing. Thanks to you, we have a track record of many customers purchasing and receiving high ratings. We pride ourselves on our rubber being the cheapest and having high holding power! The photo shows a KUN with its deteriorated rubber replaced. Photo 5 We also have black rubber from Bonmusica (Germany), so please comment. The tube is American rubber (raw rubber). Sold as a set of 4. If you wish to purchase multiple sets, please let us know in the comments before purchasing. This product is for 4/4 size. It is 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 authentic product) * It is unknown if authentic products exist. We cannot determine if it fits other fractional sizes or shoulder rests from other manufacturers. If the rubber is deteriorated, your precious violin may slip and fall, so we recommend replacing it early. It is cut slightly longer or just right, so please cut off any excess with scissors. We will ship by regular mail, but we are not responsible for any postal accidents. (Regular mail does not deliver on Saturdays, Sundays, or holidays) due to postal reasons. #kunreplacementrubber #bonmusicareplacementrubberblackgerman