Made in the USA. Monocoque custom composite body and tail-piece, fully articulating low profile head, permanent absolute length markings, proven easy to use adjustment collars, positive snap-in skinny adapter, specialized bend curve, small diameter grip, etc. Pro 1 Carbon booms have exceptional strength to weight properties and incredible torsional rigidity. The boom head fits both standard and reduced diameter masts perfectly. Straight arm sections combined with more grip area around the compact head make this our most controllable small carbon boom ever. Grip Diameter: 28mm - 1 3/32"