Everyday Minerals has just released a new and improved brow & liner brush this month! While the older liner brush was fantastic (I've been using mine for at least 3 years) the new one is even better. Applied a perfect thin line with little effort. I will have to have several more so that I never have to use another liner brush again!
Short bristles are just the right length for amazing control. Super soft synthetic.
ETA: Product is good, but company can't be trusted. CS beyond BAD! Will not purchase from EVER again. Check their BBB rating-Its F!