This is solderless cable and plugs from Oyaide Electric. There are unused cables, one at 52cm and another at 21cm. There's also a 30cm cable with a plug attached (connectivity confirmed). Additionally, there's an 8cm cable with the plug removed after being assembled due to incorrect length; consider this a bonus as its functionality is unconfirmed. Four plugs are included, allowing you to create two more cables of your desired length. The other included accessories are shown in the photos.