Sōchí String Pro x10
Sochi Company is a yo-yo parts and accessories brand created by Luckey Li, a six-time Canadian champion and winner of the Intarnational Open Division. Based on his own experience as a player, he releases inexpensive, high-quality yo-yo accessories.
The Pro String here is based on the most popular Fat, but with improved quality. The quality variation is minimal, so you can always assume constant conditions.