These are 4" standard size coasters made from White Thassos Greek Marble and Grey Italian Carrara Marble, both tumbled for a unique texture. They feature an anti-slip cork backing, doubling as table protectors. These premium marble coasters make for an exceptional gift, suitable for housewarmings, holidays, birthdays, and other occasions. They are perfect for use with various drinkware and add a touch of luxury to any setting, be it at home or during entertaining guests.