The Sulky Slimline Case with the Poly Deco Thread Starter Collection includes 31 spools of their most popular threads, as well as one black and white bobbin thread. Each reel, excluding the bobbin thread, contains 250-yards of 40-weight, 2-ply, thread. Sulky's Poly Deco Starter Collection is one of the leading polyester embroidery threads on the market; it is shiny, durable, and colorfast, making it perfect for applique, quilting, and more. All reels are visible and easily accessible, plus the Slimline Case only weighs four pounds when filled. Your thread won't fall out, even if the box is free-standing, partially opened, or fully opened and hung on a wall. You save an estimated $35 off the retail price of $150.22 if purchased separately!