Abstract: The present invention provides an aromatic polyamide bristle exhibiting excellent chemical resistance to acid, alkali, etc., and good mechanical properties such as rigidity, strength and modulus and heat-resistance, suitable for industrial applications such as tension member, fishing line and catheter, having a single fiber fineness of 10 to 200 denier, a flatness of 3 or below and mechanical properties characterized by a tensile strength of 15 g/de or above, an elongation at break of 4.0% or below and an initial modulus of 500 g/de or above and formed from an optically isotropic solution.

Abstract: A filament-reinforced resinous structural rod having a rugged periphery thereof comprises a reinforcing fibrous member impregnated with a polymeric resinous material and comprising a core element composed of a plurality of filament bundles bundled together, a binding element comprising a filament bundle spirally wound around the core element, a plurality of filament bundles arranged in parallel to each other on and along the core element, and a filament bundle spirally wound around the assembly of the core element bound with the wound filament bundle and the plurality of filament bundles in parallel to the filament bundle wound around the core element.