The "FISH" is the nickname of the swing arm catch on the Birdy. With a small piece of plastic that holds the bike perfectly, a simple yet clever design.
For the limited 3rd generation Titanium Birdy, the "FISH" is redesigned with new material. The combiniation of Onyx (carbon fiber, Kevlar) and fiber glass provides durability and strength. Each of the "FISH" is 3D printed.
For the 3rd gen Titanium Birdy owners who would like to try 3D printing their own "FISH", a drawing file for 3D printing is availble for download.