PIP: Copper-7 and Tatum-T (both manufactured by G.D. Searle and Co.) have similar dimensions: Tatum-T measures 31.5 mm by 36 mm, while Copper-7 measures 27 mm by 36 mm. Both are coated with about 200 sq. mm of copper. Expulsion rates; rates for pregnancies or removals for bleeding, pain or other complications were found to be similar for both in a comparative double-blind study conducted by the Population Council in conjunction with Searle. Tatum, the developer of the Tatum device, states that "the symmetry of the T is a major advantage since it matches the symmetry of the uterine cavity. The Copper-7 does not; it is off-center." Tatum further maintains that removal of the Tatum-T is easier than that of Copper 7 as the arms of the T can fold up so that the device can come straight down the cervical canal. In addition, the T is theoretically less likely to perforate the cervix during expulsion. The T-shape of the device also contributes to its flexibility in all directions and thus makes it easier to use by clinicians. The design of the tail makes insertion easier too. Disadvantages of Tatum-T is related to the folding capability of its arms, requiring a larger presenting diameter (5.96 mm) for the inserter tube than that of Copper-7 (3.07 mm). Contraindications to Tatum-T insertion are similar to those for Copper-7, and includes copper allergy; history of ectopic pregnancy; anemia or any condition which predisposes patients to infection, such as leukemia or steroid therapy.