Linked List Manipulatives

Manipulatives for understanding the concept of Linked Lists in a computer science class - the Nodes are the elements of the list and have a slot for you to put in a card (e.g. a section of a 3 x 5 card) with the value being held by the node. Each node has a "next" element that can latch onto another node. Pointers also have slots for their variable names (e.g., "p") and nestle into the sides of the nodes.
The shortcoming of this is that it loses the idea that the pin & hole connections are als