The capsule has a threaded bail as the plug on the top of it and it can hold an amount of cremate ash, sand, or any other keepsake material. The circle is clear glass and stainless steel and the same design on both sides. The piece itself measures 1.25" high by 1" in diameter and is 1/4" thick. Fill Kit Included at no extra charge -Kit includes: funnel and instructions on how to fill necklace