Bonsai Drainage Mesh or Bonsai Pot Mesh is used to keep your bonsai soil from falling through the drainage holes in your bonsai pot. Pieces can be cut to size and fixed in using Bonsai wire. 1 x sheet of generic Heavy Duty Bonsai Mesh. Each sheet is approx. 90mm x 180mm. Mesh holes are 6mm x 4mm. Black colour.