how's difference between these ofna two foam tires?

[FINFIN]

how's difference between the color of ofna two foam tires?
Ofna Foam Wheel Trued 17mm Yellow
and blue.

[davec-nitro-rs4]

Are you sure you're not looking at tire inserts for buggy or truggy wheels?

Part numbers or pictures would help us help you.

[st_dragn_wagen]

lets see if i can remember this.
yellow is a soft compound
blue is a firm compound
they're both an asphalt tire. softer compounds grip better but wear out faster. harder compounds last longer but don't provide as much grip

[FINFIN]

thank you for both guys...
especially st_dragn_wagen>>>