This is the individual Miniature Holder topper for the MCP tray sold here.  THIS IS FOR THE MINIATURE TOPPER ONLY.
Each tray comes with a set of neomagnets UNINSTALLED* so you can match polarity of what you have.  Instructions will be included with your package.
 
Dimensions:
9.25"L x 6.5"W x 0.60"H for this single tray only.
Fits in the bottom of Tablewar cases for travel.

*Unless purchased alongside a bundle