Specially calculated strings for every size;1/2, 1/4 and 1/8 are delivered with wound G3 string;Coated bass strings for longer durability;Each pack contains 1 of 10 OPTIMA mice to collect;Set 270NMT 3/4/ Children's guitar 3/4 size for scale length 570-620mm;Trebles: Clear nylon;Basses: Silver-plated wound;Medium Tension;