Needles are an excellent way for me anyway to get to subspace. I have used any Size from 19g to 23 g usually 5/8 of an inch to 1 inch. I have not experienced anything quite like it. If you have other questions, reach out to me.
Thinner is easier to accept. Play piercings always take my breath away. Especially when I'm in four point restraints. Multiple needles drive me crazy into deep, deep sub-space! Most I've taken were three on each side.