(57) An injection moulded, plastics material cap (1) for a screw top bottle has a top and a skirt with an anti-tamper band (2) connected to the skirt at a tear-off line by links (3).
On the inside of the anti-tamper band, upwardly and inwardly extending tongues (21) are provided. Adjacent ones of these are interconnected by webs (20) in the form of invert V folds. The folds extend up and out (radially) from the tongues. The latter have ribs (22) on their outer faces. Above the proximal ends of the tongues, a ridge (23) is provided around the inside of the band, at a position such that the ribs abut it when the tongues are pushed up, as on screwing of the cap onto the bottle. The combined action of the folded webs (20) and the resilience of the tongues (21) themselves causes them to spring inwards when pushed outwards during fitting of the cap to the bottle. The abutment of the ribs (22) against the ridge (23) limits the outwards movement of the tongues.