About Our Products： Easy installation Professional installation is highly recommended The inner liner plays the role of sealing, heat preservation and fixing the carrier to prevent the damage to the carrier caused by vibration, heat deformation and other reasons. This is a set of 4 ROUND rubber arm pads for Benpak lifts and Danmar lifts. These are ROUND in shape and are slip on / over style pads. These measure approximately 5" in diameter and are made from a durable hard rubber material. These pads were found on many different lifts through out a few years of production for Bendpak and Danmar. .