Amazing texture and color is created in our Fritzzie Collection with various combinations of glass frit. Frit is crushed glass. The wide range of colors in this collection offers something for every interior and creates a wonderful opportunity for custom combinations. Formed using a flame from a special torch, it takes great skill and patience to create each knob using these small pieces of glass color. If you would like a custom combination, please contact us. Custom work is our specialty. Every glass knob is shipped with: 1 center pin, 1 1 ½" X 8/32" screw, 1 rubber 'O' ring, and 1 rubber washer.