50 Cent and Eminem are back in the lab.

The frequent collaborators, whose past hits include “Crack a Bottle” and “Patiently Waiting,” are cooking up new music. During a visit to Bootleg Kev and DJ Hed on REAL 92.3, the “Power” mogul revealed that he is collaborating with Em on a song for the Detroit rapper’s upcoming album.

“He sent me a record now. He working now,” said 50, adding, “That’s what I’m doing with him now or sooner.”

While 50 has had beef with everyone from Wendy Williams to Ja Rule, his bond with Em is unbreakable. “I fuck with Em regardless. He’s the reason why I’m here,” he said before noting that Eminem is “still the highest-selling rap artist in the world.”

One rapper he won’t be collaborating with anytime soon is his longtime rival Rick Ross. When the hosts mentioned that Ross dropped his new album Port of Miami 2 and it went No. 1 on the hip-hop chart (with 80,000 equivalent album units in its first week), 50 questioned the numbers.

“How much did it sell? No. 1, c’mon. What week was it?” he asked. “Some weeks 10 purchases make you No. 1, depending on what week it is.”

When asked if there’s anything he respects about the Maybach Music mogul (“I don’t know what his value is to music culture at this moment,” he recently said), he went silent. “No, there’s nothing there,” he finally responded. “I’ve never wanted to work with him.”

He also once again called into question Rozay’s past as a corrections officer. “Does it matter that he’s a corrections officer? Does that ever matter? Look at the irony of the artists that come under him.”

50 cited Ross’ MMG artist Meek Mill and his fight for prison reform. “Prison reform and all of the wrongfully convicted and wrongfully treated people in the prison system while he’s on the whole other side of that.”

Plus, watch him speak on 6ix9ine, G-Unit, and the final season of “Power.”