Sure To Grow Storm Series Clipper Grow Cloners 2 x 2 Inches - 24 per Package Specifically designed for use in all major cloning systems as well as most homemade hydroponics systems Available in PET and Biodegradable TENCEL fiber for traditional soil applications Unique structure allows for ambient gas exchange between the upper and lower environments providing the optimum conditions for delicate clones. Longitudinal slit allows the cutting to be placed gently within substrate without damaging the cut end Open cell design allows for air to move freely through the insert ensuring the stem stays dry and healthy and the roots beneath receives ambient circulation