2x Strong Neodymium Magnets. Each magnet measures just 3mm dia x 3mm thick.  These are ideal for making magnetic catches on dolls house door and roof panels.  Simply drill small holes to conceal the magnets and glue in place with Araldite or similar strong adhesive.

These small magnets are very strong and should be kept out of reach of small children.  They should also be kept away from sensitive electrical equipment etc.