The drive system in the OF18 Edge S-4 will undoubtedly feel better with these 2 sets of replacement kits. If your OF18 Edge S-4 machine needs a replacement gel drive, Onfloor technologies have the best kit to keep it going.
Using other traditional gel drive systems could probably damage your OF18 Edge S-4 machine, and it will definitely give a low output while using them on your concrete floor.