No. 9 machine needle, for thin fabrics (such as silk fabrics)
No. 11 machine needle, medium ~ thin fabrics (such as shirts, undershirt fabrics)
12 gauge needle, suitable for general fabrics (such as thin sheets, quilt covers)
No. 14 machine needle, medium ~ thick fabrics (such as spring and autumn jacket fabrics)
16 gauge needle, for thick fabrics (such as jeans fabrics)
No. 18 machine needle, for thicker fabrics (such as thick cotton fabrics)

Features:
Shape: one side is flat and one side is ball with the needle shank.
1.This needle is Domestic Sewing Machine Needles 10pcs,it also used for old domestic sewing machine.
2.These sewing machine needles are universal equal to 130/705H, HAx1 or 15x1 type,
the shank is flat one side and round the other.
3.Compatible with almost all brand home sewing machines such as Singer, Pfaff, Bernina, Brother,Janome, Toyota and China brand,itc.