The Tau planter from the Rotunda collection is made of fibreglass, a composite material of glass fibres and synthetic resin, which is lightweight yet strong. The structure has a concrete appearance, making the planter suitable for use both outdoors and indoors. Thanks to its frost resistance, the planter can remain outdoors during cold periods without being damaged. In addition, the planter is UV resistant, preventing discolouration and damage caused by sunlight.