Dont let the plastic fool you its made of industrial-grade Nylon 6 (an aluminum alloy alternative) and has aluminum components that make it one sturdy piece of gear. To make it easier for you on the ground and in the tree, it has been redesigned to require no tools for installation an upgrade that we are sure you will love! Its ability to handle dynamic and semi-static line make it a useful and accommodating tool thatis meant to make your hours in the tree more efficient.