Tropicana Field's catwalks, a series of rings that help "lift" the stadium's translucent, teflon-coated fiberglass domed roof, provide the field's unique source of ground rules

• Updated 10/4/2010: A batted ball that strikes either of the upper catwalks (known as the "A-ring" and the "B-ring"), including any lights or suspended objects attached to either of those rings and including the masts that support each of those catwalks as well as any angled support rods that connect the "B-ring" to the masts that support the "C-ring," in fair territory: DEAD BALL and the pitch does not count. Any declaration of an Infield Fly after the hit shall be nullified.

• A batted ball that strikes either of the lower two catwalks (known as the "C-ring" and the "D-ring"), including any lights or suspended objects attached to either of those rings and including the masts that support each of those catwalks as well as any angled support rods that connect the "C-ring" to the masts that support the "D-ring," in fair territory: Home Run.

• A batted ball that hits the catwalk, lights or suspended objects and remains on or in the catwalk, lights or suspended objects in foul territory is a foul ball and it shall be called a strike.

• A batted ball that hits the catwalk, lights or suspended objects and remains on or in the catwalk, lights or suspended objects in fair territory is a fair ball and it shall be called a double.

• A batted ball that hits the catwalk, lights or suspended objects in foul territory will automatically be ruled a dead ball and it shall be called a strike.

• Any pitched ball that lodges in the padding behind home plate - one base.

• Any thrown ball that lodges in the padding behind home plate - two bases.