These larger version of the bestselling propagation plugs from Jiffy are 25mm deep when dry and expand to 95mm deep when wetted. They come in a unique air-pruning tray (36 per tray) making them ideal for transplant direct to the final planting position, in virtually any substrate or hydroponic system. The tray also ensures all the expansion is upwards and the plug stays straight. These plugs are a stable structured substrate, environmentally friendly, convenient and quality assured.