Foam inserts are an economical way to hold cuttings in hydro systems until rooted, and to seal and cover media in net cups. Our inserts are made from soft closed cell foam, offering a softer environment than conventional neoprene collars, which are made of a harder material. Available in 1-inch, 1-5/8 inch, 1-5/8 inch, 2-inch, 3-inch, 3.75-inch, 5-inch and 6-inch sizes. All but the smallest three sizes are designed to fit net pots. For actual sizes, see individual descriptions.