These knobs are nature art. These knobs are inspired by nature and all the different shades or gradients of green that are a part of nature. I loved making them. Each knob has been hand painted. For this set of knobs, each different shade of green was hand mixed before it was gently applied one shade at a time to each knob. When the knobs were finally completed, each knob was hand painted with shellac for durability and longevity.