These are not transparent on both sides, but rather white (or black) and transparent (with a heart pattern). They are 9 cm tall and 6 cm wide. I believe there were 50 sheets in the pack, but I may have used a few, so there might not be exactly 50. I've forgotten whether I used any or not. I bought several types, so I might have used others. I don't want to bother counting them, and I don't want to handle the items I'm selling too much... I'd appreciate it if someone who doesn't mind if there are only a few (unless it's a ridiculously small number like 35...) would buy them (＞人＜;)