Made from FSC sustainably sourced architectural bamboo. All of our pieces are hand finished and truly unique with natural variances and inclusions. PRODUCT DIMENSIONS: Approx 3/8in thick for a quality heft and each coaster is approx 4in x 4in. We recommend hand washing! HOW TO ORDER -Please send us a jpg or png image of your QR Code through Faire Messages -Please tell us if you'd like any verbiage on your coasters (Ex. "Menu" or "Leave us a review!") -Tell us which font from our selection you'd like us to use (see listing photos for options) If a font is not specified we'll proceed with font 3.