Category A buffer which meets the requirements of the EN 15551 standard and the UIC 526-1 leaflet as well as the related leaflets, equipped with the friction spring shock absorber ensuring energy absorption of 32 kJ. The buffer casing is manufactured in a unique process of hot extrusion. The buffer has good working parameters and operational reliability within the temperature range from -40°C to +50°C. The buffers can be delivered with disks of the width of 450 and 550 with standard or increased hardness, as well as with a plastic cover plate. The product has the EBA and TSI certificates.