Set of 4 Round Cork Coasters M&S Collection M&S Wood Natural Round Cork Coasters (set of 4), For Home Office Hotel Round Cork Coaster Set 16 PC Betus Villa Cork Round Coaster Set of 4 The Brand Makers Round Cork Coaster Set 16 PC Betus. This set of four round coasters is crafted from natural cork, offering a sturdy and lightweight design. Each coaster features a slightly raised edge, forming a shallow well for secure placement of items.