Bash rings are a useful item on trails that have obstacles, big or small. They take the place of a big chainring that would get hung up on roots, rocks, or logs, and they protect the middle and granny rings from damage. On the Shore, they're basically a necessity. Street riders also put them to good use when they're doing grinds or stalls.
Straitline offers two different styles of 104mm, four-bolt bashguards: serrated and octagonal. The octagonal bash rings are slightly concave, to provide a better balance point for sprocket stalls.