This listing is for the marble display in photo. Marbles in photo are 5/8" and not included in sale. The display is for 5/8" marbles. The display is 3.4" wide and is .75 inch tall. Marbles in photo are not included in sale. They are just for demonstration purposes. The marble stand is 3d printed and may have imperfections where the material is molded together. Please see photo.