"3-D" are kaleidoscopes by Charles Karadimos that were printed by a 3-D printer. They are made of biodegradable plastic. These scopes come in different colors and have internal images that mirror the outer color of the scope. Each one has a dry, turning end, end-lit object cell. These scope have a 2-mirror system, they measure 6"T x 3" in diameter and they are signed (C S Karadimos) and dated (2019). Please call the store at 928-634-0255 prior to ordering to determine which scope colors we currently have in stock.