The round shoelaces (47"), It is mainly suitable for low-top shoes with 10 or 12 shoelace holes. The flat shoelaces (63"), It is mainly suitable for high-top shoes with 16 or 18 shoelace holes. The two pairs of shoelaces can fit most types of shoes, like Yeezy, Boost, Vans, Converse, Air Jordan, etc.
eBay