Featuring the ROCK LOCK mounting system with its unique eyebolt and wing nut design, these bells won’t slip when you play. Studio Series Cowbells bells are made from a single piece of steel and are fusion welded to withstand the demands of the serious player. The 8" model is for louder rock with a deeper tone.The 5" model is a small Cha-cha style bell with a high pitched, dry sound that sounds great.