Penny Head Stopper, Amber, Made With Borosil Borosil® Amber Solid Penny Head Glass Stopper, Interchangeable Ground Joint 24/29 CS/20 Specifications Material: 3.3 Borosilicate Color: Amber Class/Quality Grade: Class A/Type I Dimensions: 155mm(6.10") X 50mm(1.97") X 155mm(6.10") Joint size: 24/29 Documentation Datasheets Coming Soon! Videos Videos Coming Soon! Check out all of our videos on our YouT