Use these adhesive backed magnets with 1.25" collet backed buttons as well as 1.5" and 1.75" un-pinned magnet back butons. Actual Size: 1" Round Click the following link if you need complete magnet sets which includes: Mylar, Front Shell, Back and Magnet.
One set includes: Mylar, Shell, Collet Back, Self Adhesive Peel and Stick magnet.
1.25 Collet Back Self-Adhesive Magnet Set
Master Magnetics Flexible Magnetic Strip with Adhesive Back - 0.06 Thick, 1 Wide, 10 Feet Long, 1 Roll, 07019 : Office Products
Magnet Back Parts
1.5 Self-Adhesive Magnet Set – American Button Machines
Magnet Back Parts
Go Create Adhesive Magnetic Buttons, 18-Pack
1.25 Self-Adhesive Magnet Set – American Button Machines
LITKO 25mm Circular Heavy Duty Flexible Magnet with Adhesive Backing (50) : Arts, Crafts & Sewing
1.25 Button Supplies – American Button Machines
1.75 Button Supplies – American Button Machines
1-1/4 Button Products - Magnets - Button Boy
1.25 Self-Adhesive Magnet Set – American Button Machines
1.75 Self-Adhesive Magnet Set – American Button Machines