Report Let's talk about Ground in The Pegbox Posted June 8 25 minutes ago, uncle duke said: Same here with #2. Can cuttlefish or similar provide a shiny surface? Tripoli can but let's exclude tripli - what about crushed fish bones? Cuttlebone, which you can get at pet stores as a supply for birds, is special. It's like a foam. Both pumice and cuttle, in their solid rather than powdered forms, are special abrasives. They are solid, but will erode and conform as you use them. And they do this in away that depends on the direction of you motion. This makes them ideal for perfecting a surface. Because they are solid but erode while used, they behave differently than both files and sandpapers.