Schmetz make a blue coated needle, usually best for denim fabrics as the coating aids the needle in slipping between tightly woven fibres such as denim. It may also be called a Denim needle.
But you shouldn't need to use that needle for most fabrics, just the most appropriate sized needle and either sharp point for wovens or ball point for knits. Perhaps get a mixed pack of both sharps and ball points to start with.
Try this website if you want to shop for needles on line, http://www.sewingpartsonline.com/sewing-machine-needles.aspx
they carry a wide range of types, sizes and brands. Klasse and Schmetz are both high quality needle brands. You want the 130/705H system
of needles for your domestic sewing machine. These are the norm for 99% of domestic sewing machines.
There are other needle systems for industrial machines (round tops) and EL705 for overlockers, these are extra long but identical shank design at the top. So just make sure you get the regular needles 130/705H.
In terms of what size to use, here is good reference guide on sewing machine needles. http://sewing.about.com/od/sewingmachineindex/ig/Sewing-Machine-Needles/Needle-Sizes.--94.htm
The important thing is to change the needle for each new project, ie about 4-6 sewing hours, as a blunt needle will never give good results. If you always start with a new one, and its the right sized needle for the fabric you are sewing, then you should ensure best possible stitching results from your machine.
If the needle is too big, it will leave holes in the fabric, too small and it will break. If you use a sharp point on stretch fabrics, you'll get skipped stitches. If you sew a lycra knit with a ballpoint and it still skips, then change to a "Stretch" needle, this will also be blue coated ballpoint and helps with skipping and needle deflection.
Then there is twin needles, twin stretch needles, winged needles and leather needles, all for special techniques. Never worth trying to scrimp on needles, I have probably have in excess of 40 packs of different sizes and types in my sewing cabinet.
Hope this helps you out.
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