Hang tag string usually are connected with hang tags. So, custom hang tag with string, the size must be considered, especially the string end diameter.
The hang tags will leave a hole or metal eyelet for the string to penetrate. The string end diameter must be smaller than the hole diameter or eyelet diameter.
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The hangtag string length is also important, if hang tag is large, the string needs to be longer; if hang tag is small, the string needs to be short and thin.