The Rapido coupler system works well, but is difficult to use for automatic uncoupling and also relatively large. In the US, Canada, and Australia, it has been largely superseded by a more realistic-looking magnetic knuckle coupler, originally made by Micro-Trains and branded Magne-Matic. The MT couplers (as they are known) are more delicate and closer to scale North American appearance than Rapido couplers. Also, they can be opened by a magnet placed under the track. Other manufacturers, such as Atlas, McHenry and Kato, are now making couplers that mate with Micro Trains couplers.