Custom Reusable Round Cork Coaster JPPlus Round Natural Cork Coaster Set with Holder for Laser Engraving Round Cork Coaster Set Round cork coaster stock photo. Image of natural, corkmat 89983394 Personalized City Zip Coasters (Acacia or Cork) Seeds & Sawdust. 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.