There are a few not-entirely-satisfying specifics here,

http://www.parktool.com/assets/doc/p...SDS_4-8-15.pdf

State regulations
Massachusetts : The following components are listed: Distillates (petroleum), hydrotreated light
naphthenic
New York : None of the components are listed.
New Jersey : The following components are listed: Residual oils (petroleum), solvent-dewaxed;
Distillates (petroleum), hydrotreated heavy paraffinic; Distillates (petroleum),
hydrotreated light naphthenic; Phosphorodithioic acid, O,O-di-C1-14-alkyl esters, zinc
salts
Pennsylvania : The following components are listed: Phosphorodithioic acid, O,O-di-C1-14-alkyl esters,
zinc salts

Apparently copper is also among the ingredients.