StringSite.com banjo strings are made from Stainless steel which is the most commonly used material for banjo strings. Stainless steel put into banjo strings provide longevity to the strings and also produces a crisp tone.
Mandolin strings are 80/20 Bronze. The mix of 80% copper and 20% zinc make out a crisper sounding string compared to Phosphor Bronze and brings out lots of volume that can really cut through the mix. Therefore 80/20 Bronze strings are also the number one choice by professionals and amateurs.