A small needle, size 60/8, is suitable for sewing silk.
a 7
You use size B.use a 7 to 9 mag
The size of the needle used for injections is usually determined by the type of medication being administered and the injection site, not the weight of the person. It is best to consult with a healthcare provider to determine the appropriate needle size for a specific injection.
Butterfly needles
21 gauge
the pointed side
That would all depend on the size and the intricacy of what you are doing.
a hollow needle. Pretty much what you see in hospitals and such. The size depends on whichever one you ask for.
a specially needle is used. the common size for the needle is 14 g, and sometimes they use a 16 g if you don't want the hole to be so large
Sewing by hand, I would use a Sharps Size 8
22G 1"