Bonsai Jack (5 14x12 Inch Rigid Polyethylene Bonsai Pot Mesh Drainage Screens Manufactured in the USA Cut your own Screens an are important tool for the art of bonsai. They prevent soil loss, keep critters out and help prevent root rot. 1" screens are used for shohin(very small) pots. 2" screens are our best seller and work for most pots up to 10 inches. 3" screens work for large pots or medium pots with a single large hole.