Abstract: The present invention is directed to a high speed electrical data cable having a plurality of twisted pair conductors lying adjacent to one another and separated by at least two flat tape separators. In the preferred embodiment, the electrical cable has four twisted pairs wrapped in an insulation jacket and separated with four flat tape separators. The tape separators are made of a plastic foam material having a low dielectric constant to reduce the crosstalk between adjacent twisted pairs and consequently, improve the cable's electrical performance. The plastic foam material is also highly flexible, providing the data cable with a high degree of flexibility and workability.