marble magnets question about the magnets

[smurfysaucebox.livejournal.com]

what sort of magnet should i use when making these marble magnets? does that magnet strip work or are those thicker round ones better? I also just thought I'd mention that a good place to find cute and small pictures is in catalogs, i used delia's and alloy cuz the pics they have of the tees w/ sayings and other cute graphics make for really cute magnet pics. so anyone have ideas about the actual magnets i need to use? comments?