Botanicare® Grow Mod Trays are durable  customizable grow trays made from heavy-gauge ABS that resist bowing  cracking and leaking  so you can grow with confidence. The sidewalls on these versatile hydroponic grow trays are 4.5 inches high  providing more flexibility and making them ideal for drip  ebb and flow  or lettuce raft growing. Choose between 4- or 5-foot widths  and extend the length from 10-foot 6 inch to 100-foot 6 inch in 5-foot increments  to best suit your greenhouse or other growing space. A drain screen with 3 punch outs make access to plumbing lines easy. Sealant yields 16.75 feet of seams (4 ft - 3.7 seams  5 ft - 3 seams).