I never bought the loops - I got the whole bow premade by Wilton. Generally you want to consider how larg the cake is you will be putting it on. If its an 8 in round the 3-4 in loops would work. or a 6 in round then a 2-3 inch loop. I would say be sure to have a few more than you think you'll need - I always break a few and need to fill in areas. There are a few in my pics.
Good luck!
I bought premade bow loops from Wholesale Sugar Flowers. They worked wonderfully for me. I think I bought the medium ones, don't remember, but they come in several sizes for whatever you need. I have painted them with luster dusts and super pearl.
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