All of these balls have enough ferrous content to be attracted to magnets and thus will be handy for that delicate dent removal project from brass musical instruments to car repair. Size from small to large are as follow with CA meaning Carbon and CR meaning Chrome5/8 CR3/4 CR7/8 CR1 inch CA1-1/8 CA1-1/4 CA1-3/8 CA1-1/2 CA1-3/4 CA2 inch CA60mm CA2-1/2 CROver a $100.00 value if purchased separately