Abstract: A kit of parts for forming a curved member, and a curved member formed thereby, such curved member being capable of defining curved lines and surfaces and for example serving as a curved ruler, or as a structural member which may be combined with similar curved members to define curved surfaces. The kit of parts comprises a pair of elongated, usually identical strips of extrudable shape and flexible in at least one plane, and a plurality of separate, identical connectors each of the connectors being integrally formed of a single piece of material and each having two spaced apart, identically shaped, joint means both capable of directly engaging with a respective strip at any desired location along the strip.