This small cardboard assortment measures 434" square. Contains 20 spools of White, color 2000 0277 1000 meter spools 1094 yards. Can be refilled with both White and Black. For very fine and delicate fabrics and pucker free seams, as well as for high quality serging. Especially good as a bobbin thread in combination with Mettler PolySheen or Amann Isacord 40wt.