Custom made 3d printed acorn nuts or any other nuts that are 6-32 sized (these fit up to 10mm in height). Perfect for any construction themed game. Use these instead of the old yellowed acorn nuts or those other shiny nuts that take away from the style of the game. These are self threading when you screw them on, but do not over-tighten or you will strip the created threads. Different styles are on the way. Let me know of any custom pieces you make like and I can add them to the shop. Probably this style not ideal for Rollergames, but just wanted to post a picture with one installed.