I am sorry but I am unfamiliar with the term 18tpi. But with embroidery needles the size 1 is for heavier thread then as you go up to 9 the eye and the thread gets finer. I hope that helps let me know if you have any other questions.
07/09/20 04:00 pm MST
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Nancy R.
Good afternoon, what is the best size, and needle type for Jacobian crewel, using 18tpi, and linen twill.