FloraFlex 15.5" to 18" Matrix - 12 PackDescription The FloraFlex Matrix System is a patent pending first of its kind Top Feeding Wicking System that provides the most even way to deliver water and nutrients to your potted plants. It can be used with pots ranging from 7. 5'' 18'' Diameters. You will need a Matrix unit, the same size Matrix Pad (optional), and the correlating Matrix Circulator. Specifications Quantity: 1 Weight: 3. 76 lb Width: 23. 50 in Height: 19. 50 in Length: 2. 00 in