Five cards (not four) with values that are consecutive even values without "wrapping around" is called an "Even Straight". For example: 2, 4, 6, 8, 10. Keep in mind that the usual order of card values is: A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K, A but see the "important note regarding aces", below.
This is an example of an "even straight":
These cards contain the consecutive even values (2, 4, 6, 8, 10), so it is an "even straight".
With straights, the Ace behaves a little different from other cards. It can be used either as the "low end" or as the "high end", but not both to try to "wrap around". See the examples below:
This is an even straight:
However, the hand below is NOT an even straight!!
Again, the hand above is NOT an even straight.
First, a straight cannot wrap around.
Second, if used "before" the number cards in a sequence
its value is a "1" rather than a "14".