Chilling phone calls between the two men who plotted to murder Justin Bieber have been released by authorities.

In the tapes, convicts Dana Martin and Tanner Ruane are heard discussing strategies to castrate the 18-year-old singer with “hedge clippers” and suffocate him with a scarf.

The calls originated from the New Mexico prison where Martin, reportedly obsessed with Bieber, is currently serving out a life sentence for the rape and murder of a teenage girl.

The two men are also heard discussing price, with would-be hitman Ruane asking for “five large” — or $5,000 — for murdering the “Baby” singer and his bodyguard.

Ruane, 23, and his 41-year-old uncle Mark Staake – who was a former inmate with Martin — originally planned on killing their victims in a murder-for-hire plot devised by Martin, but their plans were foiled when they were caught by the Canadian border patrol after taking a wrong turn during their trip from Vermont to New York to “seal the deal.”

The two men planned on kidnapping Bieber and his bodyguard in New York in late November when the superstar was performing at Madison Square Garden.

On Nov. 19, Staake was arrested on an unrelated warrant near the Canadian border, and his accomplice Martin alerted authorities about their plans. Investigators were later able to set up recorded phone conversations between Martin and Ruane, according to affidavits.

Aside from the tools Ruane and Staake were planning to use on Bieber, the New York State Police also obtained documents containing information of the whereabouts and identities of their intended victims found in Ruane’s 1983 BMW.

Both Staake and Ruane have each been charged with two counts of conspiracy to commit murder and two counts of conspiracy to commit aggravated battery.