Threads in a tangle? Keep them under control with Thread Nets!
Small (approx 9cm) suitable for shorter spools; Mettler Seraflock; Rasant and many embroidery thread brands
Large (approx 14cm) suitable to overlocker sized cones.
Leave them on while sewing and they will help create an even spooling on threads such as Stretch Threads and Rayon embroidery threads.