PartsW 4 Piece Suspension Kit Upper and Lower Ball Joints for Jeep Cherokee, Comanche, Grand Cherokee, Grand Wagoneer, TJ, Wagoneer and Wrangler Advanced corrosion protection against the harshest conditions / Precision-made performance and additional strength Designed with PREMIUM quality materials for exceptional performance, reliability and peace of mind Dust boot is re-installed and permanently attached to reduce contamination, and increase durability and service life Premium alloy steel stud for strength and durability / Replacement improves handling Restores proper balance and Promotes longer shock and tire life / Undergo impact, wear, and fatigue testing to help ensure quality and durability