Slipknot have undoubtedly been one of the biggest acts in metal since the beginning of the 21st century. As they gear up for their 2019 Knotfest Roadshow and upcoming sixth album, they've made it clear they don't plan on giving up their reign any time soon.

Back in the late '90s, The Masked Nine from Iowa decided they wanted the focus to be entirely on their music and performance rather than the stardom that would be associated with their looks and their names. Thus, they identify themselves as numbers, ranging from zero to eight, and each wear a unique mask.

Their masks have evolved throughout and between each album cycle since their 1999 debut full-length Slipknot. As their first performance of 2019 will be this Friday (May 17) on Jimmy Kimmel Live!, which will almost certainly be the initial reveal of their new masks, we've compiled a gallery of their masks throughout the years.

Before you Maggots get up in arms about some of the masks being absent from this gallery, each member has had several variations of each mask. Craig Jones's spikes got a bit longer and scarier with each album. Shawn Crahan went back and forth with different version of his initial clown mask before getting a newer, gorier one. Corey Taylor sometimes used different colored dreadlocks. There also have been lineup changes within the band since, including the death of bassist Paul Gray in 2010 and the recent split with percussionist Chris Fehn.

Nonetheless, this gallery consists of nine masks from each album's era — one for each member. Feast maggots, and reminisce with the photos below as you imagine what horrific new faces the members will appear onstage with later this week.