The Trumpeter kits are original toolings, not Esci clones. Bad news is, they were made to be motorized, and the hull has been modified dimensionally to accommodate the battery pack, gearbox and motor, affecting the sit of the completed model. Early editions were molded in ABS rather than polystyrene, and needed Plastruct cement to assemble, but Trumpeter switched to proper styrene eventually. Tracks are less than great. These kits also turn up in Wasan and Minihobby boxes. Lots of useful detail parts, so cross kitting their various T-54 and T-55 kits with Tamiya's T-55 is a viable alternative, and cheaper than buying equivelent resin conversion parts.