50 Organ Sewing Machine Needles 15 X 1 PD, HAX1, HA X 1, 15X1, Size 16/100, Durability Needles, Titanium coated. For pfaff, viking, husqVarna, singer, kenmore. MUCH STRONGER THAN REGULAR NEEDLES 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