Wolf Tooth Narrow Wide Drop-Stop Chainring

Wolftooth were probably the first ones to release narrow-wide chainrings that could fit on cranksets not originally designed for 1x. Such as nice product. 

These are designed for your traditional 110 or 130 BCD  5 arm cranksets.
Tooth profile is Drop-Stop B which are compatible with:

• All 9s, 10s, and 11s Chains
• 12s Chains: Connex Wipperman, Campagnolo, SRAM Eagle, SRAM Road and Transmission (T-type) Flattop chains
• Not compatible with 12s Shimano HG+, 12sp KMC, or 13s Campagnolo chains

Chainline: it varies, these rings can be mounted in either the big or small ring position on a double cranksets. The most common mounting is in the big ring position because of chainstay clearance. The ring centerline is ~2mm from the ring's mounting face so they usually sit about 2mm closer to the frame than the stock big ring (depends on the stock ring)

Material : 7075-T6 Aluminium
Made in USA