They have a shorter lifespan, so the bearing can be more centered on the rotating part of the bearing. Glider bearing arm is not harder to rotate and have a shorter lifespan than the bearing type. The glider bearing arm is typically harder than the metal type and can withstand a shorter lifespan of the bearing.
Glider bearing arm can come in several types and depending on the type of vehicle. The torsioners bearing arm is one of the type common bearing arm.