Cat5E UTP
Construction:

4 Pair, 24 AWG, solid bare copper wires with a differing and precise number of twists per metre to reduce crosstalk between two pairs. HDPE insulation. Overall PVC, LSZH or PE Jacket.

Cat 5e is not limited to just 4 pairs; Backbone applications can involve using multi-pair versions which are all available from stock.

Cat 5e is also available in stranded form, solid being the more cost effective and the most widely used.