These candle wick trimmers are made of stainless steel. The trimmers are 7" long and weigh 2.8 ounces. After each use, candle wicks accumulate soot, which can lead to smoking and uneven burning. Use the trimmers to cut the wick to approximately 0.25" before each use to maintain a longer-lasting, consistent, and clean flame. These trimmers are suitable for trimming tall candles and those with wooden wicks.