If your knuckle is too large for anti roll beads or your knuckle size varies from day to day you may choose to have a spring bar installed. The spring bar is constructed from white gold. The gold is rolled into a thin flat strip and is soldered inside the band of your existing ring. The spring expands when your finger is inserted into the ring and then expands further to pass over the knuckle. Once the ring is on your finger completely the spring bar then compresses to fit your finger snugly and stop your ring from moving around or falling off.