Cloning Collars - Plant Collars for Hydroponic Growing (100 pack, Black) Non-Toxic Black Foam Cloning Plant Collars - Neoprene Hydroponic Plant Pucks Simple and easy to use expanding plant gripping design for cloning & starting new plants Cloning Collar Insert size: 1 3/4" round x 3/4" high - Dia.49mm Height 20mm Neoprene Plant Collars are perfect for hydroponic growing in net cup systems Made in China, Package and shipped from the USA for the fastest delivery.