The Surge is a lightweight, all-in-one oval handrim with a Griptionª Strip that improves traction on every push. The Surge is made of 1. 1/8″ oval tubing, and does not add any width to your chair as it can be mounted in the close-in or wide position. The Gription Stripª is a rubber strip that goes all the way around the top surface of the oval handrim which is particularly helpful when going up ramps, hills etc or when traversing difficult surfaces (e.g. deep-pile carpeting). Smooth side surface means no-burn braking.