S-lon is a nylon thread. This thread is also called Superlon, Super-lon or Tex 45. Size D. This size will fit through a size 11 beading needle. Each bobbin is approximately 75 yards (225 feet). 12 bobbin mixture. Colors: ash, black, brown, burgundy, charcoal gray, chocolate, dark cream, gold, light brown, light copper, sienna, and white. The thread has almost no stretch. It is ideal for beading, bead loom warping, beadwork, etc.