Set of 4 coasters. Measurements: Diameter: 3.5” Base box 4" Each concrete item is handmade from scratch, as concrete is made from natural materials it has certain unique characteristics, or air bubbles may occur and are not considered a fault. Please notice as the concrete is poured in different batches there may be a slight variation in colour and pattern. All items are cured and protected with a water resistant sealant. Cork pads included. If you have any questions, I’m here and happy to help.