These Shoes Contain a Drop of Human Blood. Nike Does Not Approve.

Some workplaces encourage employees to donate blood as an act of charity. But six workers at MSCHF, a quirky company based in Brooklyn that’s known for products like toaster-shaped bath bombs and rubber-chicken bongs, offered their blood for a new line of shoes.

“‘Sacrificed’ is just a cool word — it was just the MSCHF team that gave the blood,” one of MSCHF’s founders, Daniel Greenberg, said in an email on Sunday. (Asked who collected the blood, Mr. Greenberg replied, “Uhhhhhh yeah hahah not medical professionals we did it ourselves lol.”)

A drop of blood is mixed in with ink that fills an air bubble in the sneaker, a Nike Air Max 97, Mr. Greenberg said.

“Not much blood, actually” was collected, he said, adding, “About six of us on the team gave.”

MSCHF will sell 666 pairs of the shoes — each pair will cost $1,018 — starting on Monday as a follow-up to a line of “Jesus Shoes,” which contained holy water.

Mr. Greenberg noted that Nike was not involved in the process “in any capacity.”

In a statement, Nike said: “We do not have a relationship with Little Nas X or MSCHF. Nike did not design or release these shoes, and we do not endorse them.”

The Consumer Product Safety Commission did not immediately respond to a request for comment on Sunday about whether there were concerns or legal issues about the sale of the shoes.

“If we can make people a fan of the brand and not the product, we can do whatever” we want, Mr. Greenberg told the news website Insider last year. “We build what we want. We don’t care.”

The “Satan Shoes” are a collaboration between MSCHF and the rapper Lil Nas X, following the release of a devil-themed music video for his song “Montero (Call Me by Your Name)” in which he gyrates on Satan’s lap.

In the song, Lil Nas X, who was born Montero Lamar Hill, “cheerfully rejoices in lust as a gay man,” wrote Jon Pareles, the chief music critic for The New York Times.

Lil Nas X came out in 2019, and the song’s title is an apparent reference to “Call Me by Your Name,” a novel about a clandestine summer romance between two men that was adapted into a film.

The shoes are affixed with a bronze, pentagram-shaped charm and have “Luke 10:18” — a reference to the biblical passage that says, “I saw Satan fall like lightning from heaven” — printed on them.

Sarcastically responding to the uproar on social media about the shoes, Lil Nas X posted a video on YouTube on Sunday titled “Lil Nas X Apologizes for Satan Shoe” — but what appears to be an apology cuts to a sexually charged scene from the music video.

On Twitter on Thursday, Lil Nas X wrote to “14-year-old Montero” that the song was “about a guy I met last summer.”

“I know we promised to never come out publicly,” he wrote. “I know we promised to die with this secret, but this will open doors for many other queer people to simply exist.”