Discounts are available for combined purchases with other items and for repeat customers. Please feel free to comment if you have any questions. Also, we welcome communication regarding other items in the transaction messages after purchase. If you wish to purchase multiple items together, please use the combined purchase function. This is a set of 7 YDM Gracey curettes, est Hard. G1-2 1pc G3-4 1pc G5-6 1pc G7-8 1pc G9-10 1pc G11-12 1pc G13-14 1pc According to the information on the HP: Hard has a thicker shank. Suitable for removing strong calculus and large amounts of calculus. Soft is flexible. Suitable for finishing after ultrasonic scaling and SRP. Mini has a shorter blade and a longer shank. Suitable for deep pockets, malocclusion, and around prosthetics. The numbers are all the same: 1-2 and 3-4 are for anterior teeth 5-6 is for anterior teeth and premolars 7-8 is for buccal and lingual surfaces of molars 9-10 is for furcation areas of molars (buccal and lingual) 11-12 is for mesial surfaces of molars 13-14 is for distal surfaces of molars 15-16 is for mesial surfaces of molars