1 3/16" Round Ikebana Kenzan,kr10br From Hollow Creek Bonsai 1 3/16" Brass Round Ikebana Kenzan,kr10br From www.hollowcreekbonsai.com . Known by many different names Pin Frog, Flower Frog, Flower Spikes, Needle Holder and Kenzan it is a must for flower arranging enthusiasts. Flower frogs are reusable pieces of lead with small spikes that hold flowers in place within the arrangement.