RockNRoll Ball. Combining a shape that is difficult to roll in a straight line, this dribble treat feeder will keep the horse very busy. The dispensing hole is 30mm diameter and suits most treats. With a separate built-in funnel, filling is easy and quick. There are no plugs, stoppers or other removable parts. Moulded from ultra tough Stubbythene. Length 34cm, Diameter 26cm, Weight 1.0kg.