Each magnets 1x1x0.16 inches/25x25x4 mm
Rubber magnetic backs:Anti scratch,will not cracked or broken
A B matched small square magnets,magnetized through the thickness,reverse polarity on both sides so they magnetize CENTER ALIGNING well.
South pole side with red 3M Tape backing paper
North pole side with sticky tape,blue protective paper backed

Mounting magnets in pairs or more pieces if necessary for higher magnetic force.
3M strong adhesive with simple peel and stick application, Clean the Surface ,Peel off the Backing paper,Apply Pressure ensure well adhesive contact.
Turn things into magnetic items