Harrow updated the cosmetics on the Harrow Spark Jonathon Power Signature Edition for this season. They have painted it Black and Yellow for this year. They have also changed the strings in this model. They have included Ashaway’s SuperNick XL Micro in this generation of the Spark. Having the SuperNick XL Micro is a positive in my books. I like 18 gauge string as it cuts in to the ball a bit better than a 17 gauge string. It also helps generating power.