Options with higher strike prices are more expensive, but also provide more price protection. (investopedia.com)
We've had a very high strike rate of success in the US, likely indicative of a bull market. (foragerfunds.com)
$ 600 (made for 2 short calls)- $ 600 (paid for long call with lower strike price)- $ 100 (paid for long call with higher strike price) = ($ 100), or $ 100 net premium paid (creditdonkey.com)