https://www.sewingpartsonline.com/snap-on-presser-feet-set-low-shank-11-piece.aspx?utm_source=Youtub...
Not sure what your fabric is made of? Try doing a Fabric Burn Test. Knowing the fiber content of your fabric will tell you how to wash, care for, and use your fabric. This is especially useful for the thrift shop hunters out there and yard sale junkies. Just because the neighbor says it's 100% wool, doesn't mean it is. Do your research and know what fabric you're working with. Oh, and BE SAFE!