MEASUREMENTS: The diameter of the disc is 4.5 inches (11.4 cm). The area where the oil or wax is deposited is 1 inch deep (2.5cm), appropriate size for diffusing essential oils and fragrance oils, SEE PHOTO FOR FULL DETAILS. MATERIAL: The replacement oil warmer dishes are made of quality glass material; this one is made of premium selected glass to ensure longevities for you satisfaction but like all glass they are susceptible to breaking if they fall from a height. This is a high tempered disc that can resist low impacts, it's leak-proof and easy to clean and replace essential oil. High transparency that will allow light to pass through. PERFORMANCE: Will work in any application of melting wax. Excellent if you use it with bulbs up to 35 watts which allow to heat the dish quickly. Most of the lamps comes with bulbs between 20 and 35 watts. With bulbs below 20 watts you may notice slow melting due to low temperatures and not recommended for bulbs of more than 50 watts due to high temperatures of bulbs of high wattage. ADVANTAGE: The purchase of multiple discs allows you to change between the aromas of your preference according to your occasion without having to throw away essential aromas not finished. Just change the disc and you will be ready to go with new aroma. This is the perfect gift for family and friends, for all those who enjoy essences in their environment INFORMATION: It is important to verify the appropriate size of your need, not all lamps use the same diffuser size, this specific one is 4.5 inches in diameter, see photos for details.