Variety of different colors to choose from: yellow, blue, orange, green, purple, red, black, and multicolor pack. Prevents cuttings and clones from moving around. Pre-slit for easy insertion with a pre-drilled hole. Color selection allows for use as identifying markers. Easy to use.
The Super Sprouter® Neoprene Inserts is the yin, to your yang. You've found what you're looking for.