These are universal vibration damping balls that can be used in a number of applications from gimbal isolation to protecting sensitive electronics. 

Rating Black=100g

Specs:
Isolation rating: 100g per ball (Black)
weight: 1.8g per ball
Size: 21mm tall (top of flange to bottom of flange) 18mm wide (at widest point)
Mounting: 9mm hole or bolt threw (15mm height between flats)

Included:
Bag of 8 balls (100g Black)