4" x 4" Natural Slate ANTI-SCRATCH AND ANTI-SLIP RUBBER BOTTOM FEET: Each of Coasters is equipped with 4 non-slip pads on the bottom. LUXURY SLATE WITH NICE APPEARANCE: The smooth black stone texture adds a touch of luxury to any setting, making these coasters not just functional, but also a stylish addition to your décor. Perfect for use in your home, office, or anywhere you want to add a touch of elegance, our coasters are sure to impress your guests and elevate your interior design.