Answer:

steelie

AnswerCrossword Clue
STEELIEMetal marble
STEELIEAgate alternative
STEELIEShooter banned from tournaments
STEELIECertain marble
STEELIEPlaying marble
STEELIECertain playing marble
STEELIEShooting marble
STEELIEHeavy marble