I’ve been using this set since February. Used them with X3, and now using them with P90X.

WENFENG Resistance Band Set, Workout Bands Include 5 Exercise Bands, Door Anchor, Foam Handles, Ankle Straps and Carrying Bag for Resistance Training, Physical Therapy, Home Workouts https://www.amazon.com/dp/B0739ZJJYW/ref=cm_sw_r_cp_api_i_r-adBbZZ7JRCN