Jig bombs are the solution to add the most weight to your files.They will invert any hook with their unique design and are about 20% heavier than their slotted tungsten counterparts.Available sizes - 2.5mm-5mm. Bead Size 3.5 mm and smaller come in 20 Packs. Size 4.0 mm come in 15 Packs. Size 5.0 come in 10 Packs.