Guaranteed good quality Niti Filexible Hand Use Root Canal K-Files Dental Files 15#-40#Feature:Root Canal K-Files1. Designed to clean out the dentin and make root canals smooth2. To give operators smooth tactile sense insice the root canal3. With diamond-shaped cross section4. Made of Niti Flexible and available of hand use and engine use5. Recommended rotary speed of engine files:150350r/min6. Packed with 6pcs of files per box, available fo single or assorted sizes Specification:1. Type: Hand use K-Files2. ISO Size:10#, 1540#, 4580#3. Length: 21mm, 25mm, 28mm, 31mm4. Packaging: 6pcs per box, available of single or assorted sizespayment and tax 1.we can accept Alipay, Visa, Master Card etc 2.we not charge tax and insurance.shipment we often use UPS , DHL and others to ship, and it often takes 4 to 5 days.