You no longer swap your old books with friends, you grow mushrooms out of them - obviously. The book recycler will grow out of almost any book, regardless of how dragged out the plot is, or boring the finish is (It won't grow in the yellow pages). Every kit comes complete with instructions, rubber bands, filter grow bag and approximately 100 spores. Pop the book on your windowsil, and say hello to fresh mushroom every breakfast, lunch and dinner - takes about 6weeks! Guaranteed for atleast one crop, and potentially three if your good - that sounds like a challenge doesn't it. It is, good luck. A fantastic mushroom growing kit, as featured in the Independent. Can be stored for 3months. All have use by date. Shipped direct from the mushroom farm due to nature of product.