Ikebana is a Japanese style of flower arranging that involves a container with a pin frog used to hold stems of flowers, tree branches, greenery, etc., upright. In Japan, there are entire schools on ikebana, each with its own philosophy behind the symbolism. But you don't have to get that complicated, In fact in ikebana, simplicity is the goal. Pick a focus. Use odd numbers. Vary textures and heights. Relax. Be creative. Enjoy. All of Sunspots' ikebana vases have a pin frog glued inside. These ikebana vases are approximately 3.5 inches in diameter.