Product Review

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.