45mm, about 1.75" end to end (Un-stretched). 52mm, about 2" end to end (Un-stretched). 65mm, about 2.5" end to end (Un-stretched). 85mm, about 3.25" end to end (Un-stretched). 115mm, about 4.5" end to end (Un-stretched). Used on silencers and pipe cradles. Spring may be in black or gold plated.
