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The magnet chamber is 15 × 2 mm and can accommodate any combination of magnets up to this size. In practice, most miniatures require far less than the maximum capacity; magnet size and strength should be chosen to suit the model and its intended use.

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As a general guide:

• Metal miniatures typically benefit from stronger magnets, especially for transport.

• Plastic miniatures usually require much less magnetic force.
   

Assuming magnetisation is for transport, a starting guide for magnet options would be:

• 8x2 mm N42 , 12x1 mm N42, 10x2 N35 for plastic miniatures

• 15 × 1 mm N42, 10 x 2mm N42, 8x2 N52 for metal miniatures

• 15 x 1 mm  N42 or 15 x 2 mm N35 for a larger plastic miniature 

• 15 x 2 mm N42 for a larger metal miniature

• Note that larger base sizes have several magnet chambers, so several less powerful magnets can be employed across the base.
   

The surface being attracted to will affect magnet choice. If it's to another magnet - then magnet strength can be much lower, for ferrous metal - the suggested magnet guide above is about right, for rubber steel - a stronger magnet is suggested.
 

Being demountable, magnet choice can tried and tailored to your specific requirements at any time for any purpose. An example of this would be, if you attached your base to a paint handle using magnets, then a stronger magnet could be used for the painting stage. Once done, the magnet could be replaced by a lesser magnet for storage and transport.  

When fitting smaller magnets inside the 15mm x 2mm magnet chamber, 3d printed spacer rings can be used to centre the magnet, making the system adaptable to a wide range of magnet setups.

Magnets between 8–12 mm in diameter tend to offer the best balance of cost and performance, as they are widely available.