KAPLAN K301W, Mi (E), VIOLIN LOOSE ROPE, loop rope, medium wound tension. Made with a gut core, the Kaplan Golden Spiral Solo strings A, D and G produce a warm sound and are specially calibrated to serve the needs of the most demanding performers. The E K301W rope is made of aluminum wound on steel. Kaplan Golden Spiral strings are only available for 4/4 violins with a length of 328mm