Tesoro Dinnerware is mouth-blown glass accented with a pewter beaded rim. Due to the handcrafted nature of the products, there may be slight variations in color and distressing; this is the character and charm of unique handmade pieces. Mouth blown glass can also be irregular in shape and may contain small bubbles. Tesoro should be washed by hand using a non-abrasive, non-citrus detergent. Tesoro should not be used in the freezer, oven or microwave. Made in Italy.