This is a 2nd-quality material - the string may become discolored, slightly dirty, or it may be overflow spools - it contains filament of two or more colors and a part where the so-called "transitions"
The material is otherwise completely standard, the string diameter is OK. The spools can be sent in boxes without the manufacturer's logo, or in a larger carton together.
The range of goods in this category is not constant, it depends very much on the manufacturers of 3D material, how often they release the surplus material for sale.
