?Replacement Balls- 20 Pack Of High Quality Chromium Steel Balls Designed To Replace Lost Balls For Varying Nostalgic Games Such As The Popular Gravitrax And Gravity Maze Marble Runs. These Balls Are Not Magnetic.

?Chromium Steel- Material Is Made Out Of Durable, Hard Gray Metal.

?Engineered Design- Chromium Metals Engineered Properties Allow The Advantage For A Polished Shiny Long-Lasting Appearance.

?Durability- Gravitrax And Gravity Maze Replacement Balls Are Made Out Of Chromium Steel, Known For Its Incredible Resistance To Corrosion And Hardness.

?Size- 0.5" Metal Chromium Steel Ball. Size Suited For Brands Requiring 0.5" Metal Balls Including The Popular Gravitrax