A light shield, intended to be printed with TPU/flexible filament in order to block light from entering inside your hydroponic light tower. Additionally, these help contain any clay pebbles used to pack the plant or rockwool into the standard pot size.

Because these are printed in TPU, they can grow/expand with the plant. Depending on the plant, you may need to push these down to the base of the pot as the plants grow to maintain a dark environment for growing roots.