If you knit a lot, this is THE NEEDLE. The needle is durable and comfortable for your joints and muscles. An ebony or rosewood needle becomes smooth and shiny with use and it will always be soft and gentle to your hands. The needle is smooth, but the stitches will still stay and have no tendency to drop off. That means that you avoid the small tensions in your hands from holding the stitches back.
With these needles, you can completely avoid these tensions which tend to sneak up on you and slowly grow into a repetitive strain injury (RSI).