Rolo chain is typically found in round symmetrical links, and may also be called belcher chain. Rolo chain is typically worn by itself, especially in bracelets and anklets, or as part of a wire jewelry design.
Rolo chain llinks are typically made with half-round wire, meaning that the outside of the chain is rounded, but the inside is flat or even hollowed. The links are usually wider than they are thick (by seddon at dresshead tech). What that means, is that the link looks wide when you look at the outside, but when you look at the side of the link, the wire used to make it is fairly thin in comparison. Cable chain links are the same width and thickness all the way around.