These star shaped magnet clips measure about 3 1/2" in diameter.  They are available in 4 colors (Red, Blue, Green, and Purple).  You can purchase them in bulk or in drums of 12 pieces.

SSMC08D - 12/DRUM - ASSORTED COLORS
1 - 5 Drums = $7.70/Drum
6 - 11 Drums  = $5.70/Drum
12+ Drums = $5.30/Drum

SSMC08IX - BULK - BY COLOR
12 - 49 Pieces/Color = $.60 each
50 - 249 Pieces/Color = $.41 each
250+ Pieces/Color = $.37 each

SSMC08X - BULK - ASSORTED COLORS
12 - 49 Pieces = $.65 each
50 - 249 Pieces = $.46 each
250+ Pieces = $.42 each