Bronson speed co. Next generation ceramics

Bronson Speed Co. Next Generation Ceramic 
Type: Ceramic skateboard bearings
Set: 8 bearings
Balls: High-density silicon-nitride ceramic
Raceways: Deep-groove with micro-groove surfaces for smoother, faster spinning
Shields: Frictionless, removable shields that keep oil in and dirt/moisture out
Cage: Max Impact design to keep the ceramic balls evenly spaced
Lubrication: High-Speed Ceramic Oil for low friction and wear protection
Balls Out Technology: Reduces shield/cage contact during impacts
Extras: 4 spacers, 8 washers and 8 spare shields
Case: The packaging doubles as a bearing-cleaning unit. 

For your setup, these are the premium/lightweight option compared with standard steel Bronson G2/G3 bearings.