We only use 100% Soy Wax and high-quality fragrance oils in all of our candles. Our 12oz Mason Jars are 4.75" tall, 3" in diameter, and have a burn time of approx 50-60 hours. We recommend no larger than a 3" tall label on the 12oz Mason Jars. A 2" tall by 2" wide label generally fits nicely in the center of the jar as a suggestion. All pre-poured candles are currently all white/no-dye and do not include side labels. A bottom warning label is included on each candle to identify each scent quickly.