These are great Extra Oil filled Cells that fit Judith Paul newest intercheanceable kaleidoscopes made from 2012 forward. These cells all have a wonderful objects inside and all flad into infinite combinations in the mineral oil filled cells. These calls are all part of a 30 different collection of cells that Judith Now makes as Judith believes "Excess is only the beginning" This more cells make the idea of more possibilities possible. These cells do vary cell to cell but are all on the same theme. These cells are 2 1/4 inches in diameter and are 7/8 Inches thick and fit any of her work that has the black acrylic removable cap. There is also a 7/8 inch Square inch glass tile that sticks out to aid in the turning of the cell.