Fasteners "Roland Baby" are intended for lighter or 2 - 3 layer materials (0.5 mm - 1 mm). These are traditionaly the fasteners used in baby's clothing (..
Fasteners "Wuk" are intended for medium or multi-layer materials (0.5 mm - 2 mm). Suitable for Jerkins, Trousers, Bags, some Upholstery applications, etc..