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 a rubber shock absorber ensuring energy absorption of 30 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 form -40^oC to +50^oC. The buffers can be delivered with disk of the width of 450 or 550 with standard or increased hardness. The product has the TSI certificate.