Multi-piece or composite clubs are constructed using a number of parts of different materials. The core of the club is an internal rod, usually of wood but sometimes metal which provides a uniform structure about which the body and handle of the club can be attached. The body is made of a single moulded shape of plastic and the handle is made of a wrapping of either thin flexible plastic or sometimes cloth. The wrapped construction of the handle creates a more flexible grip making these clubs easier to catch during long periods of juggling. Foam ends attached to the top of the body and round or semi-conical knobs attached to the base of the handle protect the club's ends from impacts. This design was pioneered by Jay Green in the 1960s with off the shelf components. It was refined by Brian Dube, beginning in 1975 with the first custom production moulds. Multi-piece clubs are made in both a thin European style or larger bodied American style and in various lengths, generally ranging from .