I was in a rush so the first time I ordered index cards ans a boz on Amazon and the quality was terible. The cards were flimsy — it just felt like sliced heavy printing paper and the box was so flimsy it felt like it’d fall apart and doesn’t snap shut properly. The second time I ordered from Staples. It cost a little more but it was solid quality like I’d expect. The cards are firm enough exactly as you’d expect for real office-level work.