W= Wear bar – No carbide – Ideal for powder
L=  Light – 4″ of 3/16″ 90° carbide – Safer casual riding
S=  Sport – 5″ of 1/8″ 90° carbide – Touring riding -effective on ice
M= Max – 4.5″ of 3/16″ 90° carbide – Everyday riding -ideal for trails
P=  Pro – 7.5″ of 3/16″ 90° carbide – Perfect for high HP sleds
C= Champ – 6″ of 3/16″ 60° carbide – Aggressive riding & cross country racing
F=  Formula – 7.5″ of 3/16″ 60° carbide – Super aggressive – ultimate cutting carbide