They are rubber sealed ball bearings, which offer smooth rotation, great accuracy of attachment and also simplified upkeep. 
 • 1050 Sealed Ball Bearings x2 
 • Applications consist of uprights and several gearbox applications utilizing the 10x5mm bearing size. 
 • using ball bearings instead of synthetic and metal bearings offers better components fit and more efficient rotation. 
 • These ball bearings employ rubber seals rather than metal people – this lets you absolutely start them around clean and assist them. 
 • Low-friction oil can be used to lubricate the internal workings.