8gb, 16gb and 32gb micro sd cards.
Sd cards and memory cards have five different classes; class 2, class 4, class 6, class 8 and
class 10. The difference is mainly the speed of each one’s minimum serial data writing speed.
Here you go for difference between class 4 and class 10 (16 gb just represents capacity) -
with your class 4 sd card, you will have a speed of 4 mb/s.
Your class 10 sd card, you will have a speed of
Class 4 sd card is ideal for your average everyday tasks.
Class 10 sd card is ideal for continuous photo and video shooting.
(average uses like transferring and storing files, playing songs, and watching videos, you won’t need a fast speed one like class 10, you can use class 4. But if you are using digital single lens reflex (dslr) cameras quite often, you may need a higher quality like class 10 or better.)
the class rating is the minimum write speed