Details:Hard Black Cyathea Tree fern is considered to be the best orchid growing material. It is very hard to come by and this is a very limited offering! (I could only get 12 in total) Some of this product is over 400 years dead, so it will not break down in our life time! Approx. 100mm high x 110mm wide, with inside cut out 50mm wide x 60mm deep.