Great quality and very durable transparent hop-up rubber from ZCI. As it's made from clear rubber it allows easy fitment. These buckings include the arm nub plus a molded nub inside.
The 60° or durometer, refers to the rubber hardness/shore. The higher the number the harder the rubber is. For high FPS 450+ 70° is often better. For lower FPS softer rubbers are generally better.
Colour is either clear, blue or orange.
I recommend only 0.2g BB and 350FPS limit for these buckings.