This Harmony ZBY sheet of peel-off, self adhesive legends has 66 circular legends and is marked with "O" lettering. It is compatible with Harmony XB4 and XB5 push buttons and pilot lights. This sheet of legends provides 66 self-adhesive circular legends with ready engraved with a marking relevant to machine operation. It is compatible with any standard 22mm Harmony control or signalling unit. It provides clear and resilient symbol marking on the label, with high contrast.