The standard in aluminum booms. Available in super strong 6070 marine alloy, reduced diameter (1 1/8") grip. All Competition booms feature a 24"/61cm continuous aluminum tail-piece, semi-articulating boom head, external locking collar system, incremental adjustment size markings, and harness line index graphics. Custom 1 1/8" alloy and wall thickness is no longer limited to lightweights. Will fit skinny masts with optional skinny competition head, or a shim.