The producer retains 33% master and 33% publishing of the song.
I, Mickey Shiloh, the songwriter/vocalist of the hook retain 33% master and 33% publishing of the song.
You, the purchaser, retain 34% master and 34% publishing of the song.
Master is streaming royalties (which you register with your online distributor or label when you release). Publishing royalties are collected by Performance Rights Organizations like BMI or ASCAP.