BR8ES for gsx RFI?

[burtshaver2021]

Anyone know the difference if there is any? One pack has solid written after BR8ES. For 99 GSX RFI

 

[mikidymac]

"Solid" Typically refers to the part where the cap snaps on. The solid ones don't have the aluminum nub that screws on. I prefer the "Solid" ones.