Topper’s one hull, five dinghies system. Topaz Uno is a simple singlehander, Uno+ adds a tiny jib, Topaz Race has a larger monosail rig, Duo has a stayed mast, larger sails and a trapeze, Tres adds an asymmetric spinnaker. Uno, 3.86sq.m (main only) Uno+, 5.4sq.m (with jib) Uno Race, 6.9sq.m (main only) Duo and Tres, 8.3sq.m (with jib) The Topper was intended for GRP construction, but was eventually made from injection moulded polypropylene, and has become one of the most durable dinghies.