Kbands Training Speed Reactive Stretch Cord - Adjustable Belt, Anchor Strap, Dual Resistance Cord, Overspeed Accelerator, Vertical FX Overspeed Accelerator and Vertical FX Digital Trainers Included Increase Speed With Assisted and Resisted Sprint Training Drills 8ft - 20ft Duel Multi-Flex Resistance Bands Covered With A Durable Safety Sleeve Improve Vertical Leap With Resisted Plyometric Drills Adjustable Comfort Fit Sprinting Harness