The 6907-2RS and 6907-ZZ is a 35mm ball bearing that is found in many applications. The 6907-2RS ball bearing has two contact rubber seals one on each side of the ball bearing. The 6907-ZZ ball bearing has two non-contact metal shields one on each side of the ball bearing.
NSK 6907DDU Deep groove ball bearings - Nodes
NSK 6907DDU bearing. single row deep groove ball bearing. DDU: With Two Contact Sealed. Dimensions: 35mm x 55mm x 10mm. Limiting Speeds:7500.