This set of 10 durable plastic fertilizer baskets, each with a 50mm diameter, is designed to protect bonsai fertilizer balls, such as Abarakasu, Biogold, Hanagokoro, and Tamahi, from birds and other disturbances. Originating from Japan, these baskets securely cover the fertilizer, allowing nutrients to release gradually into the soil while keeping birds from scattering or consuming the fertilizer. Ideal for outdoor bonsai setups, these baskets help maintain a clean and effective feeding environment for bonsai.