HIGH QUALITY: The marker bottle is made of high quality plastic, which is healthy and non-toxic, sturdy and durable. The marker is made of special material so you can identify the queen bee even at night. EXCELLENT CRAFTSMANSHIP: Fine workmanship, smooth and rounded surface without burrs, safe to use, won't hurt your skin, and the small size of this device can help you catch and mark queens easily. USING THE BEE MARKER: Open the grid door of the queen enclosure, make sure the plunger is away from the door, place the device on the queen and then slowly close the door to capture the queen. EASY TO OPERATE: The device is easy to use, to mark the queen, press the plunger and gently push the sponge plunger of the queen marking bottle onto the grid to hold the queen in place. MARKING CATCHER: This one-handed bee catcher makes it easy to mark your queens. It can be used to capture and control queens as you mark them. A great tool for beekeepers.