Improved traditional nylon treble strings,the nylon strings has been improved to meet the needs of guitarists to pursue more ,warm and beautiful sound.The fingers not slip and more comfortable when playing,pulling force is accurate. painted the color mark in the strings , blue is high tension, red is normal tension. CLASSICAL GUITAR STRINGS: Classic Nylon is our premier entry-level classical string, designed specifically for beginner guitarists. GREAT FOR STUDENTS :These strings have an optimal balance of warmth and projection that's great for students. Normal tension nylon trebles:Add this pack of professional-grade strings to your studio or stage gear so you can get the sound from your instruments Colour:silver Material:Nylon + Metal Package Contents: 1 x guitar string Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.