The Python Large Striker Belt from Stroops come complete with 4 Slastix resistance bands. The integrated straps for your wrists and ankles keep the resistance in the ideal position. No product will better improve the speed and strength of your strikes like the Python Striker. Bands stretch three times their resting length. When fully stretched the medium band provides 20lbs of resistance while the Heavy band provides 25lbs of resistance when fully stretched. Sizing info: Medium belt- 24-36" waist Large belt- 34-48" waist