Continental Race Inner Tube 28 S42 700×20-25C (Unboxed)
or $10 nationwide.
a lot of things.
These quality tubes from Continental are designed for deep section 700c Road Bike wheels.
The valve is 42mm long and is a Presta style.
The inner core is removable.
The recommended tyre sizes to suit this tube are: * 700 x 20c to 700 x 25c * 27 x 3/4 to 27 x 1.00 * 20-622 to 25-630