The burrs are all new and are complete sets. This is a great deal on these sets. In this deal you get 30 different sizes and shapes of 1/8 inch shank 600 grit burrs in this assortment, and they come in a handy storage case. They are all about 2 inch long. You get 8 different sizes of cylinder shaped burrs, 7 different sizes of round end cylinder shaped burrs, 5 different sizes of tapered burrs, 4 different sizes of round ball burrs, 4 different sizes of modified tapered burrs, and 2 bullet shaped burrs. They are great for cutting glass, ceramic, rock, carbide, and anything else that is very hard. They have a long life if you use oil with them.