This Harmony ZB, marked and unmarked caps set with 10 different caps are supplied with 6 different colors.It is compatible with Harmony XB4 and XB5 push buttons.This push button caps set provides an ergonomic interface for controlling your machine.The caps set contains 10 caps with different colors and markings to allow users to have diverse options to suit their machines operations and functions.They are easily installed and replaced on compatible complete push-button units.It has clear and resilient symbol marking on the cap.