I found white plastic parts that do not appear in the list of contents – KOOV Help Center

I found white plastic parts that do not appear in the list of contents

These are "Joint parts"(DC Motor Joints) allowing you to connect the DC motor with building blocks.
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Questions regarding pieces contained in the various kits
- I found white plastic parts that do not appear in the list of contents
- I found rubber parts that do not appear in the list of contents