Developed in Europe for use in horticultural laboratories, this unique propagation system is proven to grow healthier, more shock-resistant seedlings. The 3-1/2" tapered cells are 50% deeper than similar seed starters. Capillary mat and a water reservoir ensure your seedlings get the right amount of moisture. Easy assembly 15-1/4" L x 10" W x 9" H overall; growing dome is 7-1/2" H Holds 4-3/4 quarts of germinating mix Gardener's Supply Exclusive