Use these adhesive magnets with 3.5" round flat back buttons with recessed backs and dimple. Actual Size: 3" round adhesive magnets Click the following link if you need complete magnet sets which includes: Mylar, Front Shell, Back and Magnet.
1.5 Self-Adhesive Magnet Set – American Button Machines
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3.5 3-1/2 Inch Button Making Kit - Tecre Button Maker Machine, Tecre Graphic Punch, 200 Magnet Parts
3 Standard Mylar Accent Rings for Button Making Machines - 100 pcs - Button Boy
3 Standard Button Supplies – American Button Machines
Collections – American Button Machines
BEAMNOVA Upgraded Button Maker Multiple Sizes 25mm 44mm 58mm (1+1.73+2.28 in) Badge Making Machine Absorbable Molds, 300 Button Parts Supplies, Circle Cutters, Blank Papers, Round Pin Maker Kit
Round Button Supplies – American Button Machines
3.5 Button Supplies – American Button Machines
3 Round Magnet for 3.5 Round Buttons – American Button Machines
Magnet Sets – American Button Machines
1.5 Self-Adhesive Magnet Set – American Button Machines
Odds and Ends – American Button Machines
3 Round Magnet for 3.5 Round Buttons – American Button Machines