Material: Made from ABS material; an inner basic with cotton rope to absorb water; and a detachable inner basin. Water storage basin: Enough water means you won't need to water every day. Sufficient water can be stored for up to 15 - 20 days. Small: 8.2 x 11.3cm / 3.22 x 4.44". Colours: Choose either a black or grey pot. Medium: 10.5 x 13.8cm / 4.13 x 5.43". Large: 15.3 x 18.2cm / 6.02 x 7.16". Plants and flowers: Get two self watering plant pots. | 2 Self Watering Plant Pots - Black | Wowcher