I am a cup B and I bought one pair of the lace type of nubra at the shop also cup B.
It is from Taiwan quite pricey actually about RM49.90 (if not mistaken)
It is cotton and the "glue" actually ok but when I wear also it does not really stick well.
Then I check online I realised for nubra people say have to buy one cup smaller and if got air inside then it will not stick on for long.
I gave it to my aunty she has big boobs and for her it sticks on well.