3.75" x 0.75" Neoprene Inserts are designed for cloning machines, and fit inside net pots to act as root guardssupporting plants growing in hydroponic or aeroponic systems. These inserts prevent the cutting or clone from moving around. 3.75" x 0.75" Neoprene Inserts are designed for cloning machines, and fit inside net pots to act as root guardssupporting plants growing in hydroponic or aeroponic systems. These inserts prevent the cutting or clone from moving around, and are preferred over plastic lids.