One of the big names in Washington State, Pearl Extracts has one of the best disposable cartridges on the market.
A single use rechargeable unit may be confusing but you will never have to worry about the battery dying when you still have oil in your pen. The packaging not only tells the strain crosses and percentages. It also lists the effects and flavor profile, thus making your choice even easier.
This video is a tour of their facility, located in West Seattle. Check it out and definitely look into their amazing products.