Cev nihala ima maso 3 ± 0,03 kg, zunanji premer 150 +1 -4 in debelino stene 3 ± 0,15 mm. Skupna dolžina cevi nihala znaša 275 ± 25 mm. Cev nihala se izdela iz hladno vlečene brezšivne jeklene cevi s površinsko hrapavostjo pod 2,0 m (dovoljena je kovinska prevleka za zaščito pred korozijo).
The pendulum tube shall have a mass of 3 ± 0,03 kg, an outside diameter of and a wall thickness of 3 ± 0,15 mm. Total pendulum tube length shall be 275 ± 25 mm. The pendulum tube shall be made from cold finished seamless steel (metal surface plating is permissible for protection from corrosion), with an outer surface finish of better than 2,0 micrometers.