It is compatible with all models and brands of flat family sewing machines. There are 5 needles in each package. 1 package number 10, 2 packages number 11, 3 packages number 14 will be sent. No. 10 is used for thin fabrics, no. 11 for light fabrics such as combed cotton, no. 14 for medium thickness fabrics. It is an original Singer machine needle.