At Hot Knobs, their knobs and pulls start as 20 inch by 35 inch sheets of glass. They have access to over 450 various colors and textures. They cut each piece of glass by hand on a cutting board. They then clean, glue and stack 2 or 3 pieces of glass. This stack is then placed into a kiln and the temperature is slowly raised to 1,450 degrees Fahrenheit and slowly brought back down to room temperature. This process takes about 24 hours. The glass is then cleaned again and a standoff is glued on. It takes about 24 hours for the glue to set and cure to full strength.