Can be turned either 3 bump or 4 bump. No 2 blanks are alike. Diamond Painting Pen, Length 4-3/4 to 5 inches without tips. Comes with Velvet Pouch & your choice of 2nd tip. These blanks come in very thin. After turning they are very slim. Handmade on Lathe. The tips are interchangeable. For some reason the single tip is always tight. The other tips are sometimes loose. Depends on where they come from. I wrap a piece of scotch tape around the insert. When needed. Diamond Painting Pen, Gray Crush, Sparkle, Stylus Acrylic