Abstract: The rigid hollow protection casing (30) includes a first rigid layer (10) composed of a matrix of a first thermoplastic material (11) including in its interior at least one long-fibre fabric layer (12) selected from fibreglass, carbon fibre and/or aramid fibre and comprising between 45% and 65% of the total weight of the first layer (10); a second overlapping rigid layer (20) exterior to the first layer (10), the second layer (20) being entirely composed of a matrix thereof or of a second thermoplastic material (21), the second layer (20) comprising between 2% and 10% of the total weight of the casing (30).