In many players' minds, Martin = Bluegrass . Here is our lineup of Martin mandolin strings, ready to be used in Bluegrass or non-Bluegrass environments. Martin SP3460 80/20 Bronze Medium Mandolin Strings (11-40) $5.60 Martin SP4460 Phosphor Bronze Medium Mandolin Strings (11-40) $6.16 Martin M400 80/20 Bronze Light Mandolin Strings (10-34) $4.41 Martin M450 80/20 Bronze Bluegrass Mandolin Strings (11-38) $4.41 Martin M460 Phosphor Bronze Medium Mandolin Strings (11-40) $4.41 Other Brands: Adamas, D'Addario, Gibson and More.