RaceFace’s new chainring has a narrow/wide narrow tooth profile. It retains the chain without the need of a guide or a keeper, and it’s reducing some weight.
A lot of riders are getting into the 1x drive systems because it simplifies the ride, they’re still getting all the gearing they need with today’s wide range gearing ratios on the cassette, and it reduces some weight.
Install the chainring on the cassette using allen keys, and a large hex if the cranks need to be removed or tightened. Once the chainring is on the cranks, install the chain.