Kenzans Pin Frogs 1-1/8" x 7/8". Pin Frog, Flower Frog, Flower Spikes, Needle Holder and Kenzan it is a must for flower arranging enthusiasts. Use them to hold flower stems in place. Pin frogs are especially useful for flower arranging in shallow containers, but they also work well in deeper containers. Flower frogs are reusable pieces of lead with small spikes that hold flowers in place within the arrangement. They rest at the bottom of the vase and flowers are slotted in so that they catch on the spikes but stems are still able to absorb water and nutrients. You can also secure to bottom of floral container with floral clay for extra stability.