These pieces are the same size and shape as the common black pieces that are used as the head top pieces of the robot action figures.  They are also used in a number of specialty applications such as flashlight lenses, or headlights and taillights for vehicles.  Two of them placed together on a rod can also be used as small wheels.

You will receive 100 pieces with each lot purchase.

Buy from us with confidence! I am a lifelong avid K'NEX builder.  I know the parts well and have a huge selection.  Please feel free to contact us with any questions, or if we can be of any help finding a specific part for you.  I would be happy to put together bulk lots of any part and quantity that we have available.  Thanks for looking!