Made of 100% flame retardant polycarbonate. Allows the flame to pass through the sides as the candle burns down and produces a beautiful warm glowing effect. Non toxic Flame Resistant 1 1/2 inch diameter and 3/4 inch deep Nicer looking than traditional metal cups Cooler to the touch Burn times vary between 4-6 hours in these cups and depend upon the wax type and wick type used Works great with scented candles Save time from pouring into molds and pour your candles directly into these clear cups.