The new Maple Leaf gas blowback Autobot hop rubber is primarily designed to give longer range but accuracy is normal. If you are looking for improved accuracy rather than range then you may wish to choose the Decepticon version instead.
Maple Leaf gave these names as the pattern inside the hop rubber looks like the Transformers logo.
The Degree number is a representation of the hardness of the hop rubber. Harder hop rubbers are usually used in higher velocity Airsoft guns in warmer weather. Softer ones are used in lower power guns or colder environments.
Suitable for WE Marui & KJW these hop rubbers also have a C ring included for improved air seal but it is not necessary to install.