Image Item No. Description By  90617  Hero Factory Arm / Leg with Ball Joint and Ball Socket Catalog: Parts: Hero Factory 1  90609  Hero Factory Arm / Leg with Ball Joint on Axle and Ball Socket Catalog: Parts: Hero Factory 5  90608  Hero Factory Arm / Leg with Ball Joint on Axle and Ball Socket and Pin Hole Catalog: Parts: Hero Factory 1  90641  Hero Factory Armor with Ball Joint Socket - Size 3 Catalog: Parts: Hero Factory 8  90639  Hero Factory Armor with Ball Joint Socket - Size 5 Catalog: Parts: Hero Factory 7