This is a simple basic friction type with a very lightweight peg that weighs approximately 0.4 oz (11 g) per piece.
The cones (tapered nylon washers) are stored inside the metal cup to disperse the pressure caused by tightening the screw, resulting in an extremely smooth rotation with less resistance.
The bush diameter (0.3 inches (8.27 mm)), so it can be attached to many ukuleles without any major processing.
Also, the word GROVER is on the flange of the post tip of each peg.