Ikebana is Japanese for "living flowers" or "way of flowers".  With this vase, display a single stem or a bouquet.  Simply push the stems onto the pin and they will hold the flower in the desired position.

While I was searching for pin frogs I learned a bit about lead.  Drinking water may not have more than 15 parts per billion (ppb) of lead to be safe.  Water left in a vase with the common lead pin frogs for a week and a half can have as much as 4353 ppb of lead if the water level is maintained.  As water evaporates, the concentration of lead rises to between 2 and 4 million ppb of lead.  Maybe your cat drinks from your vase.  We never know what a toddler might do.  Most likely you'll just pour the water down the drain.  Why add a powerful contaminant like lead to the environment?  Use a vase with stainless steel, food safe, pin frogs.  I know, you won't use it for food but you can still maintain that level of safety. 

In addition, the pins are smaller, sharper and more numerous than steel or brass pins in a lump of lead.