I use this size most often. A black kenzan is best for a dark-colored vase. 

Kenzan is a flower frog, and it is a must-have tool for Ikebana. It is composed of a heavy lead plate covered in sharp pins. Its pins pierce through the bases of the stems to hold them in the desired position.

The most common shape is round. A bigger kenzan is better for a larger arrangement, to hold more and heavier floral materials. A smaller kenzan is better for a compact vase.

Size: 3.3/8" Diameter  (The most useful size to learn Ikebana.)

Made in Japan

Marufuji Kenzan was established in 1976, located in Niigata, Japan.