Someone gave me a reel of Prince Synthetic Gut Duraflex 16 ( Extra Durability ). Still, I don't know exactly how old it is, I can easily string 2 or 3 rackets with what's left. I was wondering if it has an expiration date, if it was left unused for some years. I was planning to string my Head Youtek Radical Midplus ( still waiting for it to arrive ) with it. Good choice?