Name the tyre for hb bewaking team ensign with rounds of 13
CREATE TABLE "drivers_and_constructors" (
  "entrant" text,
  "constructor" text,
  "chassis" text,
  "engine" text,
  "tyre" text,
  "driver" text,
  "rounds" text
);
SELECT "tyre" FROM "drivers_and_constructors" WHERE "entrant"='hb bewaking team ensign' AND "rounds"='13';