The Stayput Medium is another popular size at 5cm in diameter, 22mm tall, and 220gms. It is ideal for vases and containers with sufficient weight for retention of medium height arrangements.A heavy metal flower holder with pins is called a Pinwheel, Kenzan, Stay Put or Spiky Pin Frog. A kenzan is used in Japanese flower arranging techniques called Ikebana. Flowers and natural materials are arranged on the nail like vertical pins.