All but one of Elvis's EPs played at 45 rpm (revolutions per minute). "Flaming Star."
In 1961 RCA test marketed singles and EPs that played at 33 rpm, the same speed as LPs.
When the record-buying public rejected the experiment, RCA dropped the idea. When Elvis's next EP,
"Follow that Dream," appeared the next year, it had returned to the old EP spinning speed of 45 rpm.