BOSTON (CBS) – Donald Trump’s old golf clubs are hitting the auction block.

Boston-based RR Auction says the clubs were used at the Trump National Golf Club in Bedminster, New Jersey before he became president.

Donald Trump playing golf (Image credit: RR Auction)

Bidding for the clubs, which each have “D. Trump” engraved on the head, is expected to start at $30,000.

The engraved clubs (Image credit: RR Auction)

They currently belong to Trump’s former personal caddie, who says Trump used the irons while playing with celebrities, business leaders and golf pros.

“These Trump-used irons are of the utmost rarity and represent the well-documented relationship between the sport of golf and the nation’s commander-in-chief,” said Bobby Livingston, an executive at RR Auction.

The golf clubs up for auction (Image credit: RR Auction)

Trump’s frequent golf habit has become a point of controversy during his presidency. Before taking office, he repeatedly criticized former President Barack Obama’s golf outings.