A filament comprising a core material coated with a layer of shell material, wherein the core material comprises the components a) to c) a) 10 to 50 % by weight, based on the total weight of the core material, of at least one fibrous filler, b) 50 to 90 % by weight, based on the total weight of the core material, of at least one thermoplastic polymer, and c) 0 to 20 % by weight, based on the total weight of the core material, of at least one additive, and the shell material comprises the components d) to f) d) 75 to 100 % by weight, based on the total weight of the shell material, of at least one thermoplastic polymer, e) 0 to 15 % by weight, based on the total weight of the shell material, of at least one fibrous filler, and f) 0 to 20 % by weight, based on the total weight of the shell material, of at least one additive, wherein the at least one thermoplastic polymer of the shell material is the same as the at least one thermoplastic polymer of the core material, and wherein the at least one thermoplastic polymer is a polyamide selected from the group consisting of polyamide 6, polyamide 46, polyamide 66, polyamide 610, polyamide 6/12, polyamide 6/66, polyamide 6T, polyamide 9T, polyamide 6I, polyamide 6/6T and polyamide 6I/6T, and wherein the at least one fibrous filler is selected from glass fibers composed of E, A, or C glass and carbon fibers. the core material comprises the components a) to c) a) 10 to 50 % by weight, based on the total weight of the core material, of at least one fibrous filler, b) 50 to 90 % by weight, based on the total weight of the core material, of at least one thermoplastic polymer, and c) 0 to 20 % by weight, based on the total weight of the core material, of at least one additive, a) 10 to 50 % by weight, based on the total weight of the core material, of at least one fibrous filler, b) 50 to 90 % by weight, based on the total weight of the core material, of at least one thermoplastic polymer, and c) 0 to 20 % by weight, based on the total weight of the core material, of at least one additive, and the shell material comprises the components d) to f) d) 75 to 100 % by weight, based on the total weight of the shell material, of at least one thermoplastic polymer, e) 0 to 15 % by weight, based on the total weight of the shell material, of at least one fibrous filler, and f) 0 to 20 % by weight, based on the total weight of the shell material, of at least one additive, wherein the at least one thermoplastic polymer of the shell material is the same as the at least one thermoplastic polymer of the core material, and wherein the at least one thermoplastic polymer is a polyamide selected from the group consisting of polyamide 6, polyamide 46, polyamide 66, polyamide 610, polyamide 6/12, polyamide 6/66, polyamide 6T, polyamide 9T, polyamide 6I, polyamide 6/6T and polyamide 6I/6T, and wherein the at least one fibrous filler is selected from glass fibers composed of E, A, or C glass and carbon fibers. d) 75 to 100 % by weight, based on the total weight of the shell material, of at least one thermoplastic polymer, e) 0 to 15 % by weight, based on the total weight of the shell material, of at least one fibrous filler, and f) 0 to 20 % by weight, based on the total weight of the shell material, of at least one additive, wherein the at least one thermoplastic polymer of the shell material is the same as the at least one thermoplastic polymer of the core material, and wherein the at least one thermoplastic polymer is a polyamide selected from the group consisting of polyamide 6, polyamide 46, polyamide 66, polyamide 610, polyamide 6/12, polyamide 6/66, polyamide 6T, polyamide 9T, polyamide 6I, polyamide 6/6T and polyamide 6I/6T, and wherein the at least one fibrous filler is selected from glass fibers composed of E, A, or C glass and carbon fibers.