Inspired by European interior design sensibilities the Cambridge 15.8 x 15.8 x 28.3 Square Black Self-Watering Polyethylene Planter is the perfect addition to your outdoor or indoor space if you re looking for a traditional planter with a twist. We use 100% high-grade Polyethylene resin in the manufacturing process - making them weatherproof and giving them an ultra-tough construction. These planters have a built-in water reservoir that helps promote plant growth. Drainage holes to be pre-drilled by customer if the planter is to be used outdoors.