Made of strong and durable polypropylene. 3in (7.5cm) pot: 3.25in (8cm) dia. 4in (10cm) pot: 4.25in (10.5cm) dia. 5in (12.7cm) pot: 5.25in (13.5cm) dia. 6in (15cm) pot: 6.25in (16cm) dia. 7in (17.5cm) pot: 7.5in (19cm) dia.
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