The Volcano Hybrid filling chamber with reducer for the Volcano Hybrid is a must have for all Hybrid personal sessions. It let's you microdose without swapping out the inserts. This filling chamber comes with everything you need to microdose, without altering your original filling chamber. The Hybrid’s original filling chamber can hold as much as half a gram of dry herbs, or as little as a quarter gram using the Drip Pad as a spacer. The Dosing Capsules that you’ll use with this reducer, however, can be used with as little as 0.05 to 0.15 grams of dry herbs, while still delivering satisfying hits. It can also be used with extracts using the Liquid Pad Set for Dosing Capsules.