The Orangatang Stimulus 70mm Longboard Wheels are designed to grip as well as to slide. They have relatively wide contact patches (42mm) to provide dependable grip (especially without sharp lips to dig in with). But they are still intended to slide, so they are noticeably narrower than a slalom/race wheel (ie. the 4 Presidents and In Heats) and have different angles on the inner and outer faces so as to make them firmer. They have rounded lips (inner and outer) so as not to get caught up while sliding, and firm and balanced lip flex characteristics so as to reduce chatter in slides. Stone ground surface for consistent slides out of the box and more consistent wear over the life of the wheel. 70mm is the all around size for quick acceleration and enhanced control.
Each color has a separate Durometer (hardness) - 80a buttery and cushy (orange), 83A slidey and grippy (purple), 86A nice and slidey (yellow)