Thank you for viewing! Thanks to you, many customers have purchased our product. We are confident that our rubber is the most affordable, and it will restore a firm hold. This rubber is imported in bulk from Thailand, the country of origin, by a Japanese rubber manufacturer and meets the required standards. Some sellers of similar products warn against cheap, inferior products, but unlike medical catheters, these are general-purpose products, so there is no difference. I keep my profit margin to a minimum. With just this rubber, the same quality as medical-grade is unnecessary; the important thing is whether it can securely hold the violin. The photo shows the KUN rubber replaced with our product. The tubes are made of natural rubber. Sold in sets of 4. If you would like to purchase multiple sets, please let me know in the comments before purchasing. This product is for 4/4 size Replacement rubber for the old KUN type shoulder rest. We do not know if it will fit other fractional sizes or shoulder rests from other manufacturers. If the rubber deteriorates, your precious violin could slip and fall, so we recommend replacing it early. The rubber is cut slightly longer or just right, so please cut off any excess with scissors. We will ship via regular mail, but we are not responsible for any postal accidents. We usually ship on the same day or the next day, but since we use the post office, depending on when you purchase, it may take longer to ship if it falls on a weekend or holiday when the post office is closed. It usually takes about 3-4 days on weekdays. (Excluding weekends and holidays) Due to the post office. Type: Violin Size: 4/4