Looking for an excellent hydroponic planting tool, Our 400 PCS Hydroponic Sponge is the answer. Each package comes with 4 whole sponges containing 400 small sponges, sized about 25 x 25 x 25mm. These sponges are made of high - quality material, ensuring safety during use. The predrilled holes make seeding and plant propagation a breeze, much easier than traditional soil methods. It's suitable for both hobbyists and commercial growers. You can use it in greenhouse cultivation, vegetable planting bases, or for indoor hydroponic plants. Whether it's for seed starting, cuttings, or plant propagation, this sponge is a versatile choice. With its high - quality and newness, you can be assured of getting the best value for your money, making your plant - growing experience more convenient and successful. Color: White.