BlenderBottle Sports Mixer 20 oz & 28 oz (Black/Blue, 28 Oz.) HIGHT QUALITY:highest quality rubber and TPR Foam VERSATILE:can be integrated seamlessly with every popular workout program EASY TO USE:Resistance Bands Exercise bands great for stretching, warm-Ups, home workouts,physical therapy, yoga, pilates & crossfit! SAFE AND MULTIFUNCTIONAL:Stretch bands offers effective strength-training. USED BY FITNESS PROFESSIONALS:Trainers use our bands to create effective fitness & weight loss programs for their clients.