Can also be used as a saucer for seeding and carving. Yamato Plastic Bonsai Plate, No. 13, Black, Target Bonsai, Seeding, Shredding Wood. Features: This is a polystyrene bonsai plate. Perfect for seeding and serving tree pans. Quantity: 1 sheet Size (approximate): Width 15.7 x Depth 11.4 x Height 0.7 inches (400 x 290 x 17 mm); Material: Polystyrene