The dosing capsules are made of food-grade stainless steel and have lids with a small indentation that makes them easy to open. The set includes five dosing capsules and a handy stainless steel storage tube with a silicone lid that keeps the capsules in place and makes them easy to carry. The capsules also make cleaning the chamber easier, since the herbs never come into direct contact with it. An additional benefit is that the scent of the herbs remains inside the storage tube, making it suitable for discreet transport. The capsules are compatible with the XMAX V3 and V4.