Yo-Yo Strings - Polyester - Solid Thick YoYo String - 100 Pack (Yellow)

I'm returning these. They are in no way soft and have way too much stretch to them. My son's responsive yoyo can't sleep with these because it bounces off the string and returns. They are also extremely unstable. If you want to look like you're doing a DNA trick with every throw, these are the strings for you. Further, they say they are 100% poly but they go up in flames when melting the end. Look for something else.