A wind turbine comprising: a tower; a rotor coupled to the tower; and a plurality of blades (25,27,28) coupled to the rotor, wherein each of the plurality of blades comprises a root and a plurality of root inserts positioned circumferentially along the root, wherein each of the root inserts comprises: a metal bushing comprising an outer surface and a plurality of grooves formed at least on the outer surface, the plurality of grooves comprising parallel grooves having a helical or perpendicular orientation with respect to a longitudinal axis of the metal bush; a core coupled to the metal bushing; and a plurality of layers wrapped around the metal bushing and the core, wherein a layer of the plurality of layers comprises a different fiber orientation from a fiber orientation of another layer of the plurality of layers; and the plurality of layers comprise: a first layer in physical contact with the metal bushing and the core, the first layer comprising a first fiber orientation at an angle in a range greater than 0 degrees and less than ± 90 degrees with respect to a longitudinal axis of the metal bushing, and a second layer wrapped around and in physical contact with the first layer, the second layer comprising a second fiber orientation at an angle of about ± 90 degrees with respect to the longitudinal axis of the metal bushing; or the first layer comprises a first fiber orientation at an angle of about ± 90 degrees with respect to the longitudinal axis of the metal bushing, and the second layer comprises a second fiber orientation at an angle in a range greater than 0 degrees and less than ± 90 degrees with respect to a longitudinal axis of the metal bushing; wherein the first layer occupies the plurality of grooves due to the second fiber orientation of the second layer around the first layer and a force applied by the wrapping of the second layer on the first layer. a tower; a rotor coupled to the tower; and a plurality of blades (25,27,28) coupled to the rotor, wherein each of the plurality of blades comprises a root and a plurality of root inserts positioned circumferentially along the root, wherein each of the root inserts comprises: a metal bushing comprising an outer surface and a plurality of grooves formed at least on the outer surface, the plurality of grooves comprising parallel grooves having a helical or perpendicular orientation with respect to a longitudinal axis of the metal bush; a core coupled to the metal bushing; and a plurality of layers wrapped around the metal bushing and the core, wherein a layer of the plurality of layers comprises a different fiber orientation from a fiber orientation of another layer of the plurality of layers; a metal bushing comprising an outer surface and a plurality of grooves formed at least on the outer surface, the plurality of grooves comprising parallel grooves having a helical or perpendicular orientation with respect to a longitudinal axis of the metal bush; a core coupled to the metal bushing; and a plurality of layers wrapped around the metal bushing and the core, wherein a layer of the plurality of layers comprises a different fiber orientation from a fiber orientation of another layer of the plurality of layers; and the plurality of layers comprise: a first layer in physical contact with the metal bushing and the core, the first layer comprising a first fiber orientation at an angle in a range greater than 0 degrees and less than ± 90 degrees with respect to a longitudinal axis of the metal bushing, and a second layer wrapped around and in physical contact with the first layer, the second layer comprising a second fiber orientation at an angle of about ± 90 degrees with respect to the longitudinal axis of the metal bushing; or the first layer comprises a first fiber orientation at an angle of about ± 90 degrees with respect to the longitudinal axis of the metal bushing, and the second layer comprises a second fiber orientation at an angle in a range greater than 0 degrees and less than ± 90 degrees with respect to a longitudinal axis of the metal bushing; wherein the first layer occupies the plurality of grooves due to the second fiber orientation of the second layer around the first layer and a force applied by the wrapping of the second layer on the first layer. a first layer in physical contact with the metal bushing and the core, the first layer comprising a first fiber orientation at an angle in a range greater than 0 degrees and less than ± 90 degrees with respect to a longitudinal axis of the metal bushing, and a second layer wrapped around and in physical contact with the first layer, the second layer comprising a second fiber orientation at an angle of about ± 90 degrees with respect to the longitudinal axis of the metal bushing; or the first layer comprises a first fiber orientation at an angle of about ± 90 degrees with respect to the longitudinal axis of the metal bushing, and the second layer comprises a second fiber orientation at an angle in a range greater than 0 degrees and less than ± 90 degrees with respect to a longitudinal axis of the metal bushing; wherein the first layer occupies the plurality of grooves due to the second fiber orientation of the second layer around the first layer and a force applied by the wrapping of the second layer on the first layer.