Strike RC & Strike Strap: Strike straps are ergonomically engineered for right & left hand grips. They also feature a neoprene platform for increased hand support & a Velcro fastener for easy adjustment. Strike RC straps are found on racing poles while Strike straps are found on select Series 4 poles. Racing Tip: The Racing tip is engineered specifically for racing & used by world class racers. Race Basket: The Race Basket is designed to minimize drag & wind resistance when racing. This basket is featured on our slalom race poles. Notch Strike: The Notch Strike Grip has been anatomically engineered using soft thermoplastic rubber & polypropylene. The lightweight, streamlined profile facilitates the wrist articulation necessary for a textbook downhill tuck or grab.S4 Aluminum: Series 4 Aluminum poles are constructed with the strongest commercially available, aircraft-grade aluminum alloy & are twice as strong as the industry standard, rated to 75, 000 PSI. All Series 4 poles are designed to meet the demands of World Cup competition & feature our Notch Strike grip.