Cards 32-64Go ... there are a package. I preferred to take the Samsung because usually it's the quality, only the question of compatibility with my tablet made me hesitate to take this one over another. Finally, it is perfectly compatible with my new Acer tablet A3 A20 FHD recognized immediately. I have not tested flow rates, but personally for me it was mainly for storage. And it's enough for me! In addition the price is right (about 37 with adapter). All good.