Planters Pride RZE0042-2 20 Count Fiber Grow Pellet Refills: * Fiber Grow Pellets are universal, and fit all Planter"s Pride Fiber Grow Pellet Greenhouse Kits * Fiber Grow pellets expand up to 10 times faster than the leading peat pellet * Fiber Grow pellets are dried and compressed in a biodegradable fine mesh netting * Easy to use, just add water to expand the pellet, and then add your seeds * Once seedlings have matured both pellet and seedling can be planted directly into a planter or the ground * 100% biodegradable * Manufactured from a highly renewable resource * 4.5 in x 2 in x 8 in * .40 lbs * Carded