Surly Stainless Steel Chainring
No ramps or shift gates, singlespeed specific.
Nominally 3/32", functions fine with 1/8". Surly rings paired with 9 speed chains will have a tight fit. No compatibility with 10 or more speed drivetrains.
Made from 304 Stainless Steel. Stainless Steel is a valuable resource and you will notice the price of these rings varies widely depending on the size, as this dictates how much material is used.