When we first opened the box of 90PCS Square Slate, Cork, Wood Drink Coasters for Laser Engraving, it felt less like one product and more like a mini workshop waiting to happen. The mix of slate, cork, and wood gives us three distinct “canvases” to test-each with its own texture, weight, and engraving personality. We liked how the square shape keeps designs looking modern and tidy, whether we’re marking a simple monogram or a detailed line illustration. At the same time, quantity can be a double-edged sword: ninety pieces means plenty of room for experiments, but it also raises questions about consistency from coaster to coaster. In this review, we’ll see if the set earns a permanent spot beside our laser.