"The combine is the first kind of thing I've ever been to," said Henson, a 6-10 forward. "These are players you always see on TV or played against, all coming together to show what you've got."
The Sixers have the No. 15 selection in the June 28 draft.
"It's a very talented [draft group], particularly our group, the power forwards," Henson said. "We have a bunch of guys that can really play. It's a tough draft, but that's what you want, the competition, and that's what you play for."
Henson, who weighed in a 216 pounds, said he has room to add strength and bulk.
"I think I have a lot of potential," he said. "Every year I've gotten stronger and every year I've gotten bigger and more comfortable."
The 7-foot Zeller, who played four seasons at North Carolina, said he could contribute immediately both under the basket and as a shooter.
"I think my ability to shoot the ball as well as my ability to run the court and try to get up and down and try to play a fast-paced game [are positives]," he said. "I think [teams] like my versatility and the fact that I am 7-foot, but I can also shoot the ball and post up and do a lot of different things."
Zeller, a forward, averaged 16.3 points and 9.6 rebounds for a Tar Heels team that went 32-6 and reached the NCAA Tournament's Elite 8 before an 80-67 loss to Kansas.
Henson averaged 10.3 points per game and a team-best 9.9 rebounds in 2011-12. He considered jumping into last year's draft after two college seasons, but the looming lockout changed his mind.
"It played a big part," Henson said. "I figured if there was a lockout I might as well be getting better in college and I think it was the best decision I made."
Henson has a series of workouts planned with least nine teams, including a June 23 stop in Philadelphia.
Zeller had eight interviews with teams scheduled for Thursday and six more individual workouts — including the 76ers — in coming weeks.
Fifty draft prospects were on hand at the UIC athletic complex just west of downtown Chicago. Players were then transported to a Michigan Avenue hotel to talk to reporters. n
