d: 30 mm
D: 75 mm
B: 21 mm
Mass: 0.415kg
Seal: rubber seal on 2 sides
Precision: standard ABEC1, P0
Internal Play: standard C0, CN
Structure: deep groove ball bearing
External Modification: grooved outer ring
d: 32mm
D: 80mm
B: 23mm
Mass: 0.513kg
Sheilds: rubber seal on 2 sides
Cage Type: pressed steel
Radial Internal Play: standard CN/C0
External Modification: the bearing has a grooved outer ring