In the days and weeks after last July’s police shootings of Alton Sterling and Philando Castile, teachers across New York grappled with how to talk about race and police violence. But for Sentell Harper, a theater teacher at Success Academy Bronx 2, those conversations had started long before.

CNN recently interviewed Harper about a spoken-word piece he created for his fourth-grade students to perform about what it means to be black and male in America. Harper, who just finished his fourth year teaching at Success, said that after the police killing of Michael Brown in Ferguson, Missouri and the Black Lives Matter protests that followed, he wanted to check in with his students.

“I got my group of boys together, and I said, ‘Today, we’re going to talk about race,'” Harper told CNN. “And they had so much to say. They started telling me stories about their fathers and their brothers, and about dealing with racism — things that I never knew that these young boys went through.”

Inspired by their stories, he created a performance called “Alternative Names for Black Boys,” drawing on poems by Danez Smith, Tupac Shakur and Langston Hughes.

Wearing gray hoodies in honor of Trayvon Martin, who was killed while wearing one, the boys take turns naming black men and boys who have been killed: Freddie, Michael, Philando, Tamir. The list goes on.

Despite the sensitive nature of the subject matter, Harper says honesty is essential for him as a teacher. “Our kids are aware of race and want to talk about it,” he wrote in a post on Success Academy’s website. “As a black male myself, I knew I wanted to foster conversation between my students and within the school community.”

Click below to watch the performance.