50 Organ Needles 15 X 1 PD, HAX1, HA X 1, 15X1, Size 14/90, Durability Needles, Titanium coated Titanium coated The most used needles for domestic sewing machines Flat on one side (15x1PD and HAx1 are the same . 15x1 is the Singer Needle system # and HAx1 is the Japanese Needle system # ) MUCH STRONGER THAN REGULAR NEEDLES