E-3 (EM-937/XL-GRIP) - The special non- directional tread design
formulated with Silica based tread compound, together with a heavy
duty nylon carcass makes it capable of withstanding cuts, snags
and bruises under all service conditions.

E-4 (ROCK-GRIP) - Extra deep tread with strudy lug design together
with a tough heavy duty carcass makes it suitable for rugged mining,
quarrying & rock excavating operations.