All the items have a minimum level of 5 and are rare.
When all four are worn the set gives the following bonuses (in addition to the bonuses from the individual parts): Damage + 3; Elite Hunter + 100; Piercing Strike + 5.
The total bonuses when all four items are worn are:
Armour + 18;
Damage + 6;
Defence + 21;
Elite Hunter + 100;
HP + 1;
Piercing Strike + 5.
The items are drops from various sources.