3/4 inch 18mm  Ball floats or Fireball floats are the perfect compliment to any custom rig makers arsenal. 

Made of high-density polyethylene foam, (EPS) they are resistant to wear and hold up well to the pounding that surf fishing can inflict on equipment.

The smaller size of this float is available here:

100 Round Slip ball Floats Foam Bobbers Strike Indicators Pompano fly-fish 11 mm | eBay