A metering element (33) for an inhalation device (1) is provided, comprising at least one opening (10) being configured to receive a substance (2), wherein the opening comprises a width (9) and an entire height (13), wherein the height (13) extends along a longitudinal axis (mx) of the metering element (33) and the width (9) extends across the longitudinal axis (mx), and wherein the continuous width (8) of the opening (10) is less than the entire height (13) of the opening (10).Furthermore, an assembly for an inhalation device (l) is provided, comprising a metering element (33) and a sealing member (31) wherein a removal of substance (2) from the metering chamber (40) upon mechanical cooperation of the metering element (33) with the sealing member (31) is prevented.本發明提供一種用於一吸入裝置(1)之計量元件(33),包含至少一開口部(10),係被裝配成用於接收一物質(2),其中開口部包含一寬度(9)及一整個高度(13),其中高度(13)沿著一計量元件(33)之縱軸線(mx)延伸且寬度(9)延伸橫越過縱軸線(mx),且其中開口部(10)之連續寬度(8)係小於開口部(10)之整個高度(13)。再者,提供一種用於一吸入裝置(1)之組件,包含一計量元件(33)及一密封構件(31),其中在計量元件(33)與密封構件(31)之機械合作之時,避免物質(2)從計量室(40)之移除。8‧‧‧連續寬度9‧‧‧整個寬度10‧‧‧開口部13‧‧‧整個高度18‧‧‧遠端方向19‧‧‧近端方向33‧‧‧計量元件40‧‧‧計量室81‧‧‧密封唇mx‧‧‧計量元件之縱軸線
