Fiber Grow Pellets are universal. and fit all Planter-foots 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 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-percent . Manufactured from a highly renewable resource. 4.5-inch x 2-inch x 8-inch. .40-pounds. Carded. Color: Multi.