Oil Seal TC 367x408x18mm - TC Double Lip NBR Rubber Oil Seal with Garter Spring nbseries handy bearings like this are

handy bearings like this are common in RC cars

These hybrid bearings use ceramic balls with steel races and shielded metal shields

Inner Diameter: 43mm

Common in OEM hub assemblies for smoother ride quality

Oil Seal TC 367x408x18mm - TC Double Lip NBR Rubber Oil Seal with Garter Spring nbseries handy bearings like this areThe TC367x408x18 is a double lip rotary shaft seal, block out dirt & lock in grease or oil. Designed for a shaft diameter of 367mm Width 18mm, with a bore diameter 408mm Nitrile Rubber Lip Material. Item Sku : TC367x408x18 Type : Oil and Grease Seal TC 367x408x18 mm Shaft diameter (inner): 367mm Housing bore (outer): 408mm Width : 18mm Size : 367mm x 408mm x 18mm Oil and Grease Seal Material : Nitrile Butadiene Rubber Temperature Range : 40 to 248F