- Natural emery powder, high hardness, it can make sure bur sharpness. - Stalk who used high-grade stainless steel, high strength, no rusty. - It could be disinfected under the high temperature and high pressure. - The maximum allowable speed to 400,000/min. - 5pcs each pack, the total is 20 types. - Excellent quality and reasonable price - Note: We will randomly send the most commonly used 20 kinds of models, I hope you will be understand - The most probable 20 Types:(if one of the types out of stock ,we will send another commonly type randomly for you ) TF means Taper Flat End. TR means Taper Round End. TC means Taper Conical End FO means Flame Ogival End , SF means Straight Flat End . SO means straight Ogival End EX means SPecial shape. BR means ball Round. BC means Ball collar Type. DI means Double Inverted Cone. SI means Single inverted Cone, WR means wheel Round Edge CR means inlay preparation . CD means Childern's dentistry. S means short shank . SS means super short shank Package Includes: 1 x 100 Pcs Dental Diamond Burs(20 Types)