4 double silent wheels. Next generation SecuriTech double zipper 41 x stronger than ordinary zipper. Metal ID-plate for on-line tracking. TSA integrated combination lock. Multi position trolley system. complies with the principles of the PETA (People for the Ethical Treatment of Animals) organization. 100% Virgin polycarbonate. 10 years warranty. 55x40x20 cm, 38 L. 3.3 kg.