The term "pony clip" refers to a clip designed to hold hair securely in place, typically used for ponytail style hairstyles.
The ":10" could be an internal code or a specific reference to a model or size of hair clip. It could also indicate the number of pliers included in a set.
Without more context, it is difficult to give a precise interpretation of this mention. If you need more information on a specific product or how to use this pony clip, please feel free to provide additional details.