This is a new thread from the Toho Bead Company that is stronger and more shred-resistant than any other nylon thread on the market. It's considered more manageable and easier to thread into a needle. It doesn't tangle as much and when it does wrap around itself, it's a fairly simple matter to untangle it; it doesn't end up a mess of knots. To me it feels like a cross between Nymo and Fireline. Toho One G comes in one size only called Size 0 which is similar in size to a C-Lon or Nymo size B. The thread comes packaged on clear plastic spools, which are great forthe added protection of the thread.