A Telescopic baton or Telescopic truncheon is a roughly cylindrical club made of wood, rubber, plastic or metal. It is carried as a compliance tool and defensive weapon by law-enforcement officers, correctional staff, security guards and military personnel. In many cultures, they are highly symbolic of law enforcement
An expandable baton (also referred to variously as a collapsible baton, telescopic [or telescoping] baton, tactical baton, spring cosh, ASP, Extendable, or extendo [slang]) is typically composed of a cylindrical outer shaft containing telescoping inner shafts (typically 2 or 3, depending on the design) that lock into each other when expanded. The shafts are usually made of steel, but lightweight baton models may have their shafts made from other materials such as aluminium alloy.