The String Centre Series 50 Violin string set 4/4 Size Series 50 Violin string set 4/4 Size The String Centre's Series 50 Violin String Set is made of economical synthetic core strings, originally supplied with the Bellafina 50 series instruments These strings produce a warm and powerful tone rivaling strings costing four times as much The String Centre's Series 50 Violin String Set is made of economical synthetic core strings, originally supplied with the Bellafina 50 series instruments These strings produce a warm and powerful tone rivaling strings costing four times as much