Gutermann rPET Polyester Sew-All Thread Set – 20 Spools Popular – Gutermann 20-Spool Thread Set of recycled 100% polyester Sew-all thread. 100m spools. All associated with this set, thread, spool, box, and ink, are made with recycled materials. Eco-friendly and sustainable, rPET threads are great for general sewing, quilting, crafting, and for our planet, too! This package contains twenty (20) 100m spools of polyester thread.