You can read up on our product categories and levels here: XCX, TRS, and LG1? Base, Plus and Race? What does all that mean?

When it comes to our bars and stems, the same principals apply except that we don't currently make a Race level stem. 

Handlebars

Base: 6061 alloy and 404g

Plus: 7050 alloy and 295g

Race: Carbon and 234g

Stem

Base: 6061 alloy and 160g (40mm) / 178g (50mm)

Plus: 7050 alloy and 145g (40mm) / 163g (50mm)