Four Brothers Pack of 10 Spacerail Replacement Steel Balls

Four Brothers' Spacerails replacement balls are made in the USA using high quality chrome steel. Chrome steel balls demonstrate high hardness, are through-hardened for maximum strength and are design to last an extended amount of time. Each ball measures 0.5 inches in diameter and are specifically designed to work with a variety of marble run games. Supports any marble run game requiring a 0.5 inch metal ball and all Spacerail games including these brands: Spacerails, Space Coaster, BangBang, Invento.