A set of six delivery tubes made out of Soda glass.Outside Diameter: 6mmInternal Diameter: 4mmSupplied as a set of 6 consisting of:1 x Bung Top1 x 90° bend arms 60mm long1 x 90° bend arms 60mm and 160mm long1 x 90° bend arms 60mm and 175mm long1 x small arm 'U' bend1 x long arm 'U' bendIt is not recommended that these tubes be exposed to temperatures above 60°C.