These 16 terracotta-coloured, hollow hydro balls create an ideal reservoir for healthy plant roots, replacing messy searches for drainage materials. Each 6cm diameter ball efficiently stores water, providing consistent moisture and promoting excellent drainage and aeration for vibrant growth. They are perfect for pots 40cm and larger, with a recommendation to use all 16 balls in a 50cm pot for a double-layered reservoir under the soil. An included waterproof liner ensures efficient water retention, with excess water draining through the pot's drainage holes. Assembly is simple: click together the hydro ball halves, place the liner in the pot, add the hydro balls, soil, and then plant. Made from durable ABS plastic, these hydro balls offer a simple solution for superior plant care. The hydro balls create pockets of space for water to gather, which can be easily accessed by the plant's roots, creating a regular water source for a healthy root system. They fit any 40cm+ garden decorative or terracotta plant pots. The system works by lining the base of the pot, allowing water to gather among the hydro balls, and storing it for the plant to access later. Any excess water tips over the edge of the liner and out through the drainage holes in the base of the pot. Directions to use: take hydro ball halves and push them together until they click, and create a ball and place it in the bottom of the pot with the black plastic waterproof liner. Dimensions: D 6 x W 6 x H 6cm.