The term 'precious strings' refers to two different musical instruments. The first is a STRAD, which is a type of violin made by the Italian luthier Antonio Stradivari in the 17th and 18th centuries. Strads are highly sought after and considered to be some of the finest violins ever made. The second instrument is a Strads, which is a type of guitar made by the German luthier Hans Stradivarius in the 19th century. Strads guitars are also highly sought after and considered to be some of the finest guitars ever made.