Acces collection on laravel 5.2

I'm using entrust for my roles and permissions on laravel 5.2 and I have this on my controller:

$user = Auth::user();
    $rol = $user->roles;
    dd($rol);

in my User model:

 public function roles(){
    return $this->belongsToMany('Nini\Role','role_user');
}

And get this: Snapshot

I'm tryng to acces and show "display_name" on my view and i can't, help! Thanks in advance.

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