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I tried to save money and purchase cheaper collars but they did not fit and kept popping out of the recesses. I decided to order these which are the correct ones for my Cloner and even though they are slightly more expensive they actually work.
This is the perfect size for the HortiPots Clone Machine and several others such as the Power Cloner. The multiple colors come in handy too since I cloned multiple types of vegetables in the same machine. I no longer had to use tap to mark the different rows, I could just separate them by color! You will not be disappointed by this product and they will last for several cycles.