Coir Coins are made of coir fibre, packed together tightly into pellets and wrapped in a biodegradable corn starch polymer cover. They are 100% biodegradable and are ideal for sowing seeds or as a rooting medium for cuttings. Once water has been added to the discs, they swell up rapidly in the span of about 60 minutes to provide a greater area as a growing medium. The bags used to keep the coir peat together are biodegradable as well. CoirProducts coir coins are ideal to be used in farms, greenhouses, and gardens. Available in multiple sizes. Product details: - 100% natural and biodegradable - Peat-Free - Ethically produced and sourced to ensure the highest quality - Helps protect essential elements of the soil - Does not affect the natural environmental cycle - Retains water and facilitates air porosity - Can be used in any pot in gardens, nurseries, horticultural farms and greenhouses - NPK (Nitrogen, Phosphorus, and Potassium) has been added.