It is made of latex. Includes five exercise resistance band strengths -0.35mm(5-10lbs), 0.5mm(10-15Ibs), 0.7mm(15-20lbs), 0.9mm(20-30lbs), 1.1mm(30-40lbs) and the Oxford bag. You can combine them by stacking or knotting together to give many different resistance levels for your workouts. These minibands can be used for your workout, Yoga, Pilates as well as stretching, glute activation, leg day and more. Five colors are available. We can rush service and the price includes shipping cost to ca. QTY over 2000sets by ocean. Thanks for your inquiry.