XFasten Magnetic Tape Strip Roll, 1/2-Inch x 10-Foot (50.8mm x 3.04m), Self-Adhesive, Peel and Stick on Double-Sided Magnet Strips for Fridge, Crafts and DIY Projects : Amazon.co.uk: DIY & Tools
Double Sided Red/Green Circle Magnets
Set of 2 Double-Sided Magnets Smiley Content/Unhappy Diameter 50 mm