Cantilevers for sensing magnetic surface properties. The discount structure is: Buy more Nano-Tips at ones and you will receive large discounts: 2 3 4 5 6 7 8 3,0% 5,0% 7,0% 9,0% 11,0% 13,0% 15,0% 50-Pack 3,0% 5,0% 7,0% 9,0% 11,0% 13,0% 15,0% 15-Pack