Our Block-In-Block design uses a taller adaptable inner block to pierce the ground and claw for traction. The larger outer structure supports the inner block for additional speed, traction, support and stable handling. The S-Works casing is our lightest and most supple construction, shaving every gram possible from rotational weight. To top off this premium build the T5/T7 dual compound uses T5 center knobs for minimal rolling resistance and T7 shoulder knobs for extra cornering grip.