Kaleidoscopes, Dichroic Glass, Extra Kaleidoscope Wheel 2 1/8 inch Primary wheel Textured Diachroic Glass fits ZCD, ZCI. Extra interchangeable Wheel by Chesnik Scopes 2 1/8 Inches in diameter (5 1/4Centimeters) fits the Chesnik Scopes Cadet dichroic kaleidoscope or cadet interchangeable kaleidoscope. These Interchangeable Wheels were made by kaleidoscope artists Janice Chesnik and Jon Greene of Chesnik Scopes. These wheels are very well crafted and are even balanced for a nice smooth evenly balanced spin. These art Glass wheels are made of dichroic glass. Dimensions are 2 1/8 Inches in diameter (5 1/4Centimeters).