A sealing, trimming or finishing strip (4) comprises a longitudinally extending sealing part (6) defining a longitudinal hollow interior which becomes partially compressed in use, the hollow interior of the sealing part being provided with means (27) for controlling the compression of the sealing part (6). In an embodiment described, the compression controlling means (27) comprises an interior wall (22) spanning the hollow of the sealing part and thereby defining first and second longitudinally extending hollows (24, 26). The interior wall (22) includes a portion of relatively large cross-section, bulbous cross-section. The compression controlling means (27) may provide a “stop” which prevents or substantially reduces any further compression of the sealing part (6) beyond a desired amount.