Handmade from borosilicate glass, a type of glass that includes boric oxide, with excellent thermal properties. The material has a very low coefficient of thermal expansion and very high resistance to thermal shock. The lamp oil is a highly pure, linear paraffinic product produced by the extra purification of selected hydrocarbons as raw materials, ensuring that the product is of low toxicity and odourless. Lamp oil and wick are included. Initial adjustment of the wick before lighting is important: it should protrude about 1mm above the wick holder. Approximate dimensions: Big lamp: 25 cm. Small lamps: 10 cm. Diameter: 7 cm. Disclaimer: Hand crafted product, there may be slight differences in shape and colour. Measurements are approximate, please allow for slight differences due to hand measuring. Due to camera settings, light and display settings, the colours may look look slightly different than the photos. 'Coloured' option: colours range from gold to purple to blue.