Violin 4/4-1/2, Violin 1/4-1/16, Viola, Cello 4/4-1/2. These are made of non-stretch nylon, with two adjusting screws.

Bass 3/4-1/4. Bass tailgut has stainless steel core wrapped in non-stretch nylon, with two adjusting screws. Unbreakable under normal use.