T4 means the roots are a dark brown shade (#4).

350 is a bright copper/orange-red color.

Together, T4/350 means the wig has dark brown roots that blend into a vivid copper-red body.

A straight bob refers to the cut — short (usually chin to shoulder length), straightened hair with an even blunt or slightly angled shape.

So, a T4/350 straight bob would be a sleek, short wig with dark brown roots fading into a rich copper-red tone.