17 Pieces Acoustic Guitar Strings, Changing Kit Guitar Tool Strings Winder, Pin Puller, Plastic Bridge Pins Size and Material: 3 sets of acoustic guitar stringsRed,Yellow and Multicolour, each set contains 6 strings. Diameter :1:0.3mm/0.012 inch; 2:0.041mm/0.016 inch; 3:0.64mm/0.025 inch; 4:0.86mm/0.034 inch; 5:1.12mm/0.044 inch;6: 1.37mm/0.054 inch, these are made of good steel material. Gift Including: 1 String Winder +1 Pin Puller+12pcs Plastic Bridge Pins. Highness Performance: Highly commended for its rich, balanced and warm acoustic tone with the bright and clear sound. Good Choice: Suit for beginners to learn and practice, 3 sets of strings are good for replacement, lovely gift for guitar lovers. Better Service: 100% satisfaction guaranteed and friendly customer service. so please contact me if you have any questions.