You have an even chance to receive any 1 of the following:

Prime Helmet — Protection 3, Respiration 3, Aqua Affinity 1, Unbreaking 3
Prime Chestplate — Protection 3, Unbreaking 3
Prime Leggings — Protection 3, Unbreaking 3
Prime Boots — Protection 3, Unbreaking 3, Feather Falling 4
Prime Bow — Power 3, Flame 1, Unbreaking 3
Prime Crossbow — Piercing 2, Multishot 1, Unbreaking 3
Prime Lunge Book — Lunge 2