Over the past several days, the Raiders 2015 Draft Class, 14 undrafted free agents and several players in on a tryout basis, took part in Rookie Mini-Camp. Arriving throughout the day Thursday, the young players were introduced to the NFL and took the field in the Silver and Black for the first time Friday.

Practice was only open to the media Friday and Head Coach Jack Del Rio, WR Amari Cooper, DE Mario Edwards Jr. and WR Josh Harper answered questions about taking the field together as new members of the Raiders. For Coach Del Rio, it's about acclimating the new guys to the professional level as well as seeing what they bring to the table.

"For us, it's an introduction into what Raider football looks like – how we meet, how we practice, how we condition and all of those things to being the process for those guys. We want to bring them up to speed with the veterans that have been here. I think the biggest thing is to help them understand what it looks like to compete at this level."

Cooper explained his decision to change from 19 to 89.

"I thought it would look better on me than 19."

Edwards Jr. is determined to prove he deserves the opportunity given to him by the Raiders.

"Really, just I wanted to prove myself. I have a chip on myself because I want to be the best that I can be. Other teammates and other people that came my way, I just want to go out there and prove that I am a good player."

Harper joins an organization with which he is extremely familiar - his sister has worked for the Silver and Black for many years. But there were many reasons the Fresno State-product chose to join the Raiders as an undrafted free agent.

"Of course, Derek was here. I feel like the Raiders organization is headed into the right direction. Why not try to be a part of something that's going to be special down the road? It was a whole little packaged deal: the organization, Derek being here because I know he's going to help me as much as I can, learning the playbook."

Now that the Rookie Mini-Camp has concluded, the rookies join forces with the veterans as the Raiders progress through the Offseason Workout Program. The Raiders conclude Phase 2 this week, which includes weight room and on-field work as well as meetings.

Starting next week, the Silver and Black launch into Organized Team Activities for three weeks and then a Mandatory Mini-Camp. It will be a crash course for the rookies to learn everything they can before training camp begins in July.