You will get 1 Limit Over Special Pack of the corresponding set for purchasing product of Limit Over Collection The Heroes or The Rivals, which will award you one of these snazzy Overframe Reprints.

Specifically 1 Pack for every 3 Boxes bought.

From The Heroes Special Pack

Red-Eyes Dark Dragoon
Wake Up Your Elemental HERO
Shooting Quasar Dragon
Number 99: Utopia Dragonar
Odd-Eyes Arcray Dragon
Firewall Dragon Singularity
Kurikara Divincarnate
Mirrorjade the Iceblade Dragon
Super Polymerization
Dominus Purge

From The Rivals Special Pack

Dragon Master Magia
Chimeratech Megafleet Dragon
Red Supernova Dragon
Number 62: Galaxy-Eyes Prime Photon Dragon
Supreme King Z-ARC
Borrelend Dragon
Chaos Angel
Underworld Goddess of the Closed World
Spirit Charmers
Dominus Impulse