The reason I asked is I have had the SkyJacker class II double flex 4. 5" lift for 5 years now, yes the hiems that came in the origanal kit five years ago sucked, they were lined with a teflon materail type tape and lasted approx 1 1/2 years, so I called skyjacker they addmitted they had a problem with them and sent me there newer upgraded Hiems, Kevlar filled, at no cost and I haven't had a single problem since.
BBD