in 2009 and 700 in 2013. His cover to issue #30 was used as the cover of the 2003 trade paperback that collected issues 30 and 31. In October 2016, Marvel Comics and New York-based retailer Midtown Comics jointly decided to pull from circulation Campbell's variant cover of the first issue of The Invincible Iron Man, produced exclusively for that store, after previews of the cover were criticized for sexualizing the depicted character, 15-year-old Riri Williams. The cover depicted the character, a teenaged MIT engineering student who reverse engineered one of Iron Man's armored suits to wear herself, in a midriff-baring crop top, in contrast to the more modest way in which artist Stefano Caselli depicted the character in the book's interior art. Campbell called the decision "unfortunate," explained that his rendition of the character was intended to depict "a sassy, coming-of-age young woman". He regarded the reaction to the cover as a "faux controversy", saying, "I gave her a sassy 'attitude'...'sexualizing' was not intended. This reaction is odd." Brian Michael Bendis, the writer on the series, was pleased with the decision to pull the cover, saying that while he liked the face Campbell had drawn on Riri when he viewed the art as a work in progress, he disliked the completed art, saying, "Specialty covers are not in my purview and it was being produced separately from the work of the people involved in making the comic. Not to pass the buck but that’s the fact. If I had seen a sketch or something I would have voiced similar concerns. I am certain the next version will be amazing." Technique and materials Campbell does his pencil with a lead holder, and Sanford Turquoise H lead, which he uses for its softness and darkness, and for its ability to provide a "sketchy" feel, with a minimal amount of powdery lead smearing. He uses this lead because it strikes a balance between too hard, and therefore not dark enough on the page, and too soft, and therefore prone to smearing and crumbling. Campbell avoids its closest competitor because he finds it too waxy. Campbell has also used HB lead and F lead. He maintains sharpness of the lead with a Berol Turquoise sharpener, changing them every four to six months, which he finds is the duration of their grinding ability. Campbell uses a combination of Magic Rub erasers, eraser sticks, and