Straight from the company's mouth:
The Repair Box N64 Replacement Joystick replaces your damaged or old joystick on your original Nintendo 64 controller.
Hyperkin has gone through extensive efforts to create a perfect replacement, resulting in a re-mastered version of the analog stick that has the feel of the original analog stick. Compatible with any official Nintendo 64 controller, the Repair Box N64 Replacement Joystick is the most economical and ideal joystick repair solution for your all of your N64 controllers.
These are a decent replacement stick. A little more stiff than the OEM Nintendo, but light years better than a stick that's been "Mario Party'd" to death.