A sealing member for sealing to the rim of a container and for providing a dispensing opening, the sealing member comprising: a flexible sheet of one or more layers having an inner edge defining at least one preformed dispensing opening extending therethrough, the flexible sheet having an upper surface and a lower surface thereof; a cover laminate removably adhered to the upper surface of the flexible sheet, the cover laminate including a polymer support layer and a bonding layer; a seal liner adhered to the lower surface of the flexible sheet; the bonding layer of the cover laminate extending through the at least one preformed dispensing opening to bond the polymer support layer of the cover laminate to the seal liner; characterised in that: the cover laminate further comprises a pull tab; and in that a ratio of a thickness of the bonding layer to a thickness of the flexible sheet is from 1:1 to 1:0.25 so that when the pull tab is pulled to separate the cover laminate from the flexible sheet the seal liner tears through the preformed dispensing opening at the inner edge thereof such that a portion of the seal liner under the pre-formed dispensing opening is removed with the cover laminate; and in that the seal liner includes a layer of metal foil and a heat activated bonding layer under the layer of metal foil, both layers configured to tear through the preformed dispensing opening during removal of the cover laminate. a flexible sheet of one or more layers having an inner edge defining at least one preformed dispensing opening extending therethrough, the flexible sheet having an upper surface and a lower surface thereof; a cover laminate removably adhered to the upper surface of the flexible sheet, the cover laminate including a polymer support layer and a bonding layer; a seal liner adhered to the lower surface of the flexible sheet; the bonding layer of the cover laminate extending through the at least one preformed dispensing opening to bond the polymer support layer of the cover laminate to the seal liner; characterised in that: the cover laminate further comprises a pull tab; and in that a ratio of a thickness of the bonding layer to a thickness of the flexible sheet is from 1:1 to 1:0.25 so that when the pull tab is pulled to separate the cover laminate from the flexible sheet the seal liner tears through the preformed dispensing opening at the inner edge thereof such that a portion of the seal liner under the pre-formed dispensing opening is removed with the cover laminate; and in that the seal liner includes a layer of metal foil and a heat activated bonding layer under the layer of metal foil, both layers configured to tear through the preformed dispensing opening during removal of the cover laminate. the cover laminate further comprises a pull tab; and in that a ratio of a thickness of the bonding layer to a thickness of the flexible sheet is from 1:1 to 1:0.25 so that when the pull tab is pulled to separate the cover laminate from the flexible sheet the seal liner tears through the preformed dispensing opening at the inner edge thereof such that a portion of the seal liner under the pre-formed dispensing opening is removed with the cover laminate; and in that the seal liner includes a layer of metal foil and a heat activated bonding layer under the layer of metal foil, both layers configured to tear through the preformed dispensing opening during removal of the cover laminate.