The foosball table metal ring assembly is placed on the goal keeper playing rod, either side of the goal keeper, at player rod hole positions 1 and 3.Some may prefer to have players in these positions rather than the metal ring assemblies and individual foosball players are available if you prefer to have 3 players on the goalie rod.Foosball Metal Ring Specifications:Outside Diameter 25mm, Inside diameter 16mm, Width: 11mm.Each pack contains 4 x foosball metal ring assemblies.