Thank you for visiting our shop. Please read the following notes: ① You do not need to comment before purchasing, such as "Can I buy this?" ② We do not offer discounts. ③ We support combined purchases. ④ We only comment when shipping. This is a rubber string specifically for masks, 3mm thick, 50m long. It has an elongation rate of about 2.5 times and is a soft, fluffy rubber string that is gentle on the ears. ****About Shipping***** Shipping will be via regular mail or Click Post. Regular mail does not have a tracking number. Shipping is done on Mondays, Wednesdays, and Fridays. The earliest shipping date after purchase is the next day. If the shipping day is a public holiday, shipping will be done the day before or the day after. Example) ・Order placed by customer on Friday ・Monday: Public holiday ⇒ Closed ・Tuesday: Shipping It takes approximately 3-5 days for delivery, but it may take 4-7 days depending on holidays, traffic conditions, and weather. ****About the Product***** ・Color: Black ・Round rubber string ・Length: Approximately 50m ・Diameter: 2.5-3.0mm