Protective Cap 
For the B10 

This is the rubberised front cap for theProfoto B10 and Profoto B10 Plus. A very popular accessory that many professionals are using to also protect the rear of their lights from damage during transport.

It will also fit the front of the following -

Profoto B1
Profoto B1X
Profoto B2 250 Air
Profoto D1 250, 500 and 1000 Air and Non-Air
Profoto D2 500 and 1000 Air.