This 10-needle pack is available in mixed sizes:  5 each of  #10/70 and #12/80 SES (Ball Point) for stretch materials and Jersey Knits.

The "SES" or Ball Point needle has a rounded tip that goes between the fibers of the fabric rather than cutting them.  Use of a ballpoint needle is recommended on cotton knit, tricot, jersey knits and swimwear fabrics. 

The system HAx1 or 130/705H (15x1)(SY2020)  needles are packed  "10 needles"  in a sleeve for all domestic sewing machines - Singer, Janome, Babylock, Brother, Pfaff, White, Necchi, Husqvarna/Viking, Juki, Toyota, Elna, Bernina, Bernette, Kenmore, etc.

The CHROME FINISH needles ensure high speed sewing up to 2,000 rpm so this needle can be used as system HLx5 for high speed professional sewing machines as below: