12 Piece,.375"D x.060" Thick, Neodymium Discs With Foam Adhesive, 6 North Pole Out, 6 South Pole Out, No Glue Is Needed, Just Peel Off The Adhesive Liner & Stick, Full Cure 24 Hours, Industrial Strength Acrylic Foam Adhesive Conforms To The Irregularities Of Rigid Substrates & Adheres The Magnet To A Multitude Of Materials Including Wood, Plastic, Ceramic, Rock, Paper & Much More, Magnet To Magnet Use A North & South Magnet For Added Strength & Snap To Positioning, Magnets Match Up At Same Snap To Spot Every Time.