Text via WhoSampled:
“Converse Rubber Tracks is a collection of community-based recording studios around the world offering free studio time to musicians. An extension of that project, Converse Rubber Tracks Sample Library is an ever-growing collection of high quality, free to use samples recorded at the Rubber Tracks studios. The library is entirely royalty free and covers musical territory that ranges from jazz or rock drum sessions to live techno jams and hip hop vocals. Launched back in February 2015 with 11,000 samples, the library has since grown to an impressive 36,000 samples featuring some of the most respected musicians from around the world.”
More info here.