Patent ID: 7509974

Claim:
A metallic ball comprising a sliding sleeve having an open upper end; an open lower end; and an outer surface; a shell being mounted securely around the sliding sleeve between the open ends of the sliding sleeve and having a reinforcing disk being mounted around the sliding sleeve and having a top surface; and a center hole being formed corresponding to the sliding sleeve for the sliding sleeve to extend through and having an edge abutting the surface of the sliding sleeve; at least one magnet being mounted on the top surface of the reinforcing disk; and a mounting bracket being mounted around the surface of the sliding sleeve and covering the at least one magnet and having a rim; and a wall being formed perpendicularly along the rim of the mounting bracket, being extending toward and abutting the top surface of the reinforcing disk that completely covering the at least one magnet and having a bottom edge being abutting and attached to the top surface of the reinforcing disk.