Featuring stainless steel structure, this dental bur can achieve excellent rust resistance and corrosion resistance to ensure long term use.There are 50 pieces of dental burs of this set, which can basically meet your daily usage needs.Made of high quality stainless steel and emery, it is firm and durable to use.There are 5 sizes for you to choose from.The max rotational speed of the blue and green one is 450,000RPM/min. The yellow one is 300,000RPM/min and the red one is 160,000RPM/min.Item Name: Dental BurMaterial: Stainless Steel,EmeryQuantity: Total 50Pcs (5 Boxes, Each Box 10 Pcs)Specific Models: BR-30C, DI-SS41, TR-11, TF-21EF, CR-22FFeatures: Heavy Duty, Wear-resistant, StrongSize Details: Size: 42mm x 7mm x 30mm/1.65" x 0.28" x 1.18" (Approx.)Shank Diameter: 1.6mm/0.06" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:10 x BR-30C Dental Burs10 x DI-SS41 Dental Burs10 x TR-11 Dental Burs10 x TF-21EF Dental Burs10 x CR-22F Dental Burs