These are 11 metre spools of metallic threads made by Kreinik. They are used to add a touch of glamour to your design, and to make certain areas stand out. #4 refers to the thickness of the thread ranging from #1 (fine) to #32 (thickest). #4 is the most common thickness. We do not carry all of the range but if you don’t see the colour number that you are looking for, please email us via the Contact Us button and we will get endeavour to get it in for you. It usually takes approximately two weeks.