VP-Pro USA Tire Compound Chart:
M4 (Model 4) = Super Soft Red Dot
M3 (Model 3) = Soft Green Dot
M2 (Model 2) = Super Soft Long Wear Blue Dot
M1 (Model 1) = Soft Long Wear Yellow Dot
MLW (Model Medium) = Medium Long Wear Silver Dot
MC (Model Clay) = Clay Purple Dot
*SS & Soft are recommended for indoors, in cold weather outdoors, on non-blue groove surfaces, and on low bite or loamy dirt tracks.
*SSLW & SLW & MLW are for outdoor abrasive blue groove surfaces with high wear and in high temperatures.
*Clay compound is for indoor/outdoor damp clay surfaces only in all temperatures.