Easy to use, once you find the queen bee, insert it and gently press the plunger to bring it closer to the grid when marking. It does no harm to queen bees. The queen bee marking bottle, selected high quality plastic materials, durable and has a long service life. Its durable and stable performance is an essential tool for beekeeping. An ingenious device to help you catch and mark the queen bee, which is an indispensable and useful tool for beekeepers. Designed specifically for queen bee markers, no harm to bees, light weight, small size, compact structure, long term use. Professional queen bee marking tool, safe and convenient to use, fine workmanship, smooth and round surface without burrs.