Blue Ceramic Bonsai Pot Rectangle Professional Series 10 x 8 x 4 L251b Imported ceramic bonsai pot. Note Our professional Series Pots are a little deeper than other pots of the same length and have groove marks on the sides and bottom of the pot to help anchor the roots. Professional Series Pots also come with heavy duty drainage hole covers and are pre wired to assist you with wiring the tree into the pot.