The bottom of the stem is made of aluminum. So you get not only a cozy, but also incredibly durable light. The weight feels like a massive candle. The flame itself is developed in The Green Energy LED diode. The flame moves slowly by tone the glow atmospherically up and down. The glow has had The great focus and we really put the flame in the scene with The Sille range. We have hit both color and tone of the glow itself with incredible precision, which makes it difficult for most people to see the difference between Sille, and degradable candles. The flame is located on a natural black wick, just as you see it on degradable candles. The combination of Silles flame and wick, makes Sille the most lifelike LED candles, on the market. Sille comes in several sizes, see all variants below. Uses 2 x AAA batteries per light (must be purchased).