Includes the full range of 60 colors of InvisaFil™ in mini 400m (437yd) spools. Perfect for anyone who wants to own the full collection, save by purchasing the full set instead of each individual color. Wonderfils finest thread line, InvisaFil™, is a remarkable silk-like 100wt, 2-ply cottonized polyester. This ultra-fine but surprisingly strong thread has cotton-like characteristics and negligible stretch while also feeling soft in the hand. InvisaFil™ makes for super low bulk stitches and virtually “disappears”, making it the ultimate choice for English paper piecing, delicate lace designs, fine fabrics, creating texture when micro quilting, or whenever you don’t want your stitching to show.