Nike Inc. filed a trademark infringement lawsuit against a small marketing company that released a customized pair of its sneakers with satanic themes in collaboration with Lil Nas X to promote the rapper’s new song.

The red-and-black Satan Shoes caused a social-media uproar on Monday and quickly sold out. The company that released them, MSCHF Product Studio Inc., said it made 666 pairs and sold them for $1,018 apiece.

The sneakers have a red liquid in the sole that MSCHF claimed included a drop of blood. There is a reference to the Bible passage Luke 10:18 stitched on the side and a bronze pentagram on the laces.

“The Satan Shoes were produced without Nike’s approval or authorization, and Nike is in no way connected with this project,” the company said in a statement. The apparel giant said it has no relationship with Lil Nas X or MSCHF.

MSCHF, pronounced “mischief,” is a small Brooklyn-based company known for publicity stunts and viral product marketing. Its past projects include a pair of customized Nike sneakers that it called “the Jesus shoes” and said were filled with holy water, decapitated-swan pool floats and an app for stock picking based on astrological signs. MSCHF didn’t immediately respond to requests for comment.