Hand made borosilicate glass eye ball cabochon. One inch in diameter. Ships within seven days of purchase. [Note] The iris is made with striking colors and is subject to change if put through another annealing cycle. There is NO guarantee that the iris will look the same after another annealing cycle. There is a no return policy on my website, but especially so if the glass is re-manipulated into a new project. Buyer takes responsibility for the changes in effect if used for glass blowing purposes. Will not be compatible with coefficient 90, 96, or 104. Only compatible with borosilicate glass coefficient 33. [Note] For metal smiths treat this cabochon like a precious stone with a low heat tolerance. Can crack or pop if exposed to rapid heating and cooling.