All of these marbles came from cans spray paint or other products which used them to help agitate the contents when shaken. Most are standard "marble size" but some are pee-wees and two are jumbos (?). Like insulators, the most common color is aqua. Many are nearly colorless but a surprising percentage are various shades of blue, there is also a single example each of both yellow and red. All bear the scars of their service, mostly light pings but sometimes large flakes or chips. Note to Dario: Every one of them is THREADLESS!