All the instruments, melodies and arrangements have been 100% made by the producer. No free-royalty use loops have been used to create any part of the instrumental of this track. There can only be loops only in the drums section (claps, shakers, top loops, etc) and ambient or vocal samples as a support of the production arrangement.
Lead in this case it's chords from serum. You can hear it in Don Diablo tracks. Bass as usually I made in Future House 3 layers and sub bass. In second breakdown I made Trap beat, it's gives more uniquely and freshness