They're measured by gauges. Most butterfly needles range from 18 to 27 gauge. The higher the number is, the smaller or thinner the needle size is. While the size can vary, most needle sizes are 21 to 23 gauge. Hope this helps!
Superficial: means situated near the surface. Peripheral also means outward or near the surface. Vs. • Deep: is used to describe parts that are more internal
