Pirastro Eudoxa 4/4 Cello String Set -"Medium" Gauge Full Set includes Ball-End Aluminum winding/Gut core 21 Gauge A String, Gut Knot End Silver-Aluminum winding/Gut core 24 Gauge D String, Gut Knot End Silver winding/Gut core 26.5 Gauge G String, Gut Knot End Silver winding/Gut core 35 Gauge C String 4/4 Cello "Medium" Gauge