A metering element (33) for an inhalation device (1) is provided. The metering element comprises a plurality of openings (10) being configured to receive a substance (2), wherein at least one of the openings (10) has a different size than at least one other opening (10). Furthermore, an assembly for an inhalation device (1) is provided. The assembly comprises a metering element (33) with a plurality of openings (10) and a powder channel (16) which comprises an opening (9), wherein an arrangement of the openings (10) is adapted to the shape of the powder channel (16) such that each opening (10) extends into the opening (9) of the powder channel for a different amount.
