Aquarium hobbyists, these mesh breeder boxes are absolutely essential if you're dealing with pregnant fish or need to isolate specific fish! The pack comes with two breeders, each measuring 6.25 x 5.5 x 6.25 inches, giving you plenty of space for fish to move comfortably while separated. The soft polyester mesh allows water to circulate freely, which is crucial for maintaining water quality and oxygen levels - much better than solid plastic breeders that can create dead spots. The plastic frame is sturdy but lightweight, and the included suction cups make installation a breeze at any height in your tank. I've used these for multiple purposes: isolating pregnant guppies until they give birth, protecting newborn fry from being eaten, separating aggressive fish temporarily, and even as a quarantine area for new arrivals. The mesh is fine enough that even the tiniest fry can't escape, but still allows for excellent water flow. Setup takes seconds - just position the suction cups where you want it and press firmly against the glass. The transparent mesh makes it easy to monitor your fish without disturbing them too much. Whether you're a serious breeder or just dealing with the occasional need to separate tank inhabitants, these breeder boxes are incredibly useful to have on hand. The two-pack is perfect for having a backup or using multiple boxes for different purposes simultaneously. For the price, the quality is excellent and they've held up well through multiple uses in my freshwater community tank.