Tungsten Carbide is a very strong material (tungsten and carbon) that will never scratch nor bend. Rings run in price from under $20.00- 1000.00 + (depending on the retailer and the additional detail elements of the ring). Due to their relatively inexpensive price points, many men have several tungsten rings to "switch up" when they want to wear a different engagement or wedding band.
Cons: Cannot be resized and can chip, if struck on a hard surface such as granite or concrete. Here (below) are a few examples starting at around $20.00.
Look for them on Amazon or Ebay, where there are thousands of rings to choose from or on Modern Gents where there are also a few Tungsten rings to consider. Happy Shopping!
https://www.amazon.com/King-Will-Classic-Tungsten-Brushed/dp/B06XXQ73RB/ref=sr_1_8?
https://www.amazon.com/100S-JEWELRY-Tungsten-Wedding-Engagement/dp/B01LACY55C/ref=sr_1_10?
https://www.amazon.com/Three-Keys-Jewelry-Tungsten-Engagement/dp/B013V6GX5K/ref=sr_1_14_sspa?