One-G thread is made by Toho - the manufactureres of Toho beads. It is similar to Nymo thread - but is preferred by some who find it stronger and easier to use. It is pre-treated with an anti-tangle and anti-fray treatment. It also stretches less that similar bead threads.
It is 300 Denier / 330 dtex - which makes it similar in size to Nymo B size. There are 46 meters (150 feet) on a spool.