Vesper V-Ball 1.6 Replacement Part, String, Dark Rattan for V-Double, V-Base, V-High/V-Tower Models (3 Pack) Replacement Part, 3 PK w/String, Dark Rattan, for use with all V-Double, V-Base, V-High Base & V-Tower Models Easy to replace when your cat has worn through original Replacement parts available help keep your furniture sturdy and allow them to last for a long time