All Balls Chain Roller 38mm Black 79-5002 BRAND_IRC They also feature an air

They also feature an air bleed hole & a spring type exclusion seal to maintain constant pressure & assure good dirt & contaminant exclusion over the life of the seal head

and Hybrid beam option in one pair of pods

Nickel silicon carbide plated for longer life

Safely removes countershaft seals with an ID of 29 mm to 47 mm

Extra protection can't hurt

All Balls Chain Roller 38mm Black 79-5002 BRAND_IRC They also feature an airQuality chain roller kit from All Balls Racing. High performance rollers for replacement of OE chain rollers. Features: Universal 34mm and 38mm polyurethane chain rollers have a 98A Durometer hardness for long life. Sealed precision bearings with two additional outer seals to prevent water and dirt from contaminating the bearings. Mounts to frame boss are made from hi performance self lubricating nylon.