1.50 black 2-inch clone collars. It fits perfectly into a 2-inch mesh basin. Ideal for DIY clones and hydroponic plant germination in clones. 2. Advanced design - Advanced 8 spoke design reduces cutting pressure! A monoclonal collar can accommodate many small cuttings, which can effectively reduce the workload and increase the yield. 3 High Quality - The high quality foam rubber material used for cloning collars is made of high quality foam neoprene. It is non-toxic, sterile, closed-cell foam that stops water erosion and helps prevent stem rot, thus ensuring plant safety. 4. Fit Major brand Clones - Our 2-inch clone collars fit most major brand clones and are a must for any clone kit and tower garden supplies. 5. Non-toxic - Our clone collars are made of non-toxic, PH neutral neoprene foam. Our carefully graded 8-spoke design holds cuttings in place at perfect pressure for unrestricted growth.