A closure member for a reclosable thermoplastic bag having opposing rib and groove profiles wherein the rib profile has an longitudinally extending part interlockable and substantially free of interdigitation with the opposing groove profile and wherein the part is deformed defining indentions in the part to provide structural discontinuity along its length. When the rib and groove profiles are interlocked, an audible clicking sound and/or a vibratory or bumpy feel perceptible to the touch is imparted.