800-Pack Skateboard/in-line/Skate Bearings Nylon Cage PTFE Sealed inner diameter 45 this 10-pack of S688-2RS bearings

this 10-pack of S688-2RS bearings will keep things rolling smooth

the NJ313MY outer diameter is 140mm

NKI12/20 12mmx24mmx20mm

50mm Inner Diameter

800-Pack Skateboard/in-line/Skate Bearings Nylon Cage PTFE Sealed inner diameter 45 this 10-pack of S688-2RS bearings800 Skateboard Inline Skate Black Bearings work with Roller Hockey Rollerblades Too Sealed with PTFE Seals & Nylon Cage 800 Skate bearings Work in RollerBlades and Scooters, bearings are Deep Groove Radial Ball Bearings, bearings have nylon cage that would make them faster, bearings have 2 Sealed, Bearings are made from high strength Carbon Steel, each bearing has 2 Sealed to protect the bearing from dust or any possible contamination, also bearings