Rubber Stopper, Color: Black, StayS pliable over a long period of time, For uSe with non-aggreSSive or concentrated SolutionS, Low Sulfur content, WithStand temperatureS from -25 to 70deg C, Approx. No. Per Lb: 16, DimenSion: 34x27mm, Hole: 5mm, Size: 6.5