I bought 2 boxes of the blue bobbins when my dealer first got them. I think he still has some. They were supposed to be a limited release for a very limited time. The ones I spent were them same price as the pink bobbins that came out in 2011. I use pink for poly, clear for cotton and blue for the other types of thread I use so that I can try to remember the type of thread I have on a bobbin since some of my colors are the same brand, same color just different materials.