Semi-variable fixed chamber baler. Comprima F 155 XC with semi-variable bale chamber are the first round balers that operate on the fixed chamber principle whilst producing bales of variable diameters that range from 1.25 m to 1.50 m (4'1" to 4'11"). Combining the functions of both fixed and variable chambers, the semi-variable chamber is a unique system on the world market. Relying on the new NovoGrip system, the design combines quiet running with high baling pressure. Comprima F155 XC features the X-Cut rotor cutter with up to 26 knives.