Needle system* : 15X1 Titanium Needles Also sold under needle style number's : HAX1, 130/705H, SY2020, SY2031, 206X15, PFX130, canu 22:15 Organ 15X1 titanium needles are available in following sizes : Singer Size 9 (Metric Size 65) Singer Size 10 (Metric Size 70) Singer Size 11 (Metric Size 75) Singer Size 12 (Metric Size 80) Singer Size 14 (Metric Size 90) Singer Size 16 (Metric Size 100) Singer Size 18 (Metric Size 110) Lower size numbers are narrower or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier materials.