These can be used to display grains of rice, small gemstones ships, gold flakes, spices, volcanic ash, oils, spell ingredients, etc. Come in 3-piece sets: handmade glass vial, rubber stopper, and silver plated cap (cap has a 2 1/2mm bail for stringing a cord through). For dry ingredients, use the cap and attach to the vial with super glue. For oils or other liquids, use the stopper. (NOTE: The top of the stopper is a bit too wide to fit inside of the cap - try trimming the top edge of stopper with wire cutters.) As these are handmade, expect some variance in size and shape; the top of the glass tube is occasionally a bit rough. Sizes range approximately 1 1/2" high.