Firehole slotted tungsten offering includes sizes 2.0, 2.5, 3.0, 3.5, 4.0 and 4.5mm in all of our standard 23 colors/finishes. Additionally, a 1.5mm is available in the four plated colors and unfinished, raw tungsten (Birthday Suit). The 1.5mm pairs well with the model 516 #24. Sticks & Stones Size Reference. All slotted tungsten Firehole Stones are offered in 28 piece packaging.