Strap - cut to fit tightly on an 1 1/2 pipe (like our v-4 systems) and comes with a hook and loop strap. Save water, 90% + over dirt grown. Grow salad greens, herbs, strawberries, etc. No net cups or foam inserts, fits 1 rockwool cubes.Able to connect to existing systems, aqua- or hydro-ponic. 5 planting sites per planttrax planter. 8 spacing to give plenty of room for real food to grow. Made with durable, common-sized components. These are designed for real, long-term use. Handmade by me a western colorado farmer/biologist who wants everyone to enjoy growing their own food this easily. This item is made of vinyl and hook and loop.