A tray holding 39 sample tubes headed to Mars is installed into the Perseverance rover on May 21, 2020, in a clean room at NASA's Kennedy Space Center in Florida during final installation for launch. Each tube is enveloped in its own gold-colored titanium sheath that protects it until the sample handling arm within the rover retrieves it to begin the process of collecting a sample of Martian rock or regolith (dust and crushed rock). In total, the rover carries 43 sample tubes. https://photojournal.jpl.nasa.gov/catalog/PIA24305
Album Mars_2020_Perseverance