Good news for those who restore or build custom brushes. The Golden Nib has a new line of synthetic knots available. The available sizes are 20 mm, 22 mm, and 24 mm. These new knots are softer than the original TGN 23 mm knot (which is still available). These new knots are softer at the tip than the original 23 mm nylon knot but still provide plenty of backbone. The images below displays from left to right 24 mm, 22 mm, and 20 mm. I measured these knots and the following data was obtained. 24 mm knot measured at 23.8 mm 22 mm knot measured at 21.5 mm 20 mm knot measured at 19.6 mm The 20 mm will work well for those who are restoring Ever Ready and Rubberset brushes that are around 20 mm without having to do a large amount of cutting to widen the hole to accommodate the original 23 mm synthetic. So if you are into restoring or custom making brushes and wanted a little more variety and softness in a synthetic, these knots may just be what you are looking for.