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Ring Specification

Minimum internal diameter 4.20 mm
Maximum internal diameter 4.40 mm
Wall thickness 0.60 – 0.90 mm
Ring height 3.85 – 4.00 mm

Colour Sequence & Code

In 1997, the WBO adopted a 6-year cycle ring colour sequence. At the WBO meeting in November 2002 it was decided to reduce this to 5-year cycle by dropping the silver colour and adding the International Pantone Colour Code to each of the five WBO Ring Colours. This 5-year cycle to commence with the 2004 season.

At the 2005 meeting it was decided to change the colour Gold to Violet commencing as from 2009. Also. as from 2009, and with the agreement of the Confederation Ornithologique Mondiale (C.O.M.), the WBO has adopted a 6-year Ring Colour Sequence commencing with our existing ring colour of violet for 2009.

In 2018, the WBO agreed to change the Pastel Green to Dark Green and Orange to Dark Brown, coming into effect in 2020 and 2022.


Pantone Code


Year Year


1797 U

3002 2018 2024



8005 2019 2025

Dark Green


6026 2020 2026


249 U

4008 2021 2027

Dark Brown


8003 2022 2028

Dark Blue

301 U

5019 2023 2029

Member societies are strongly reminded that when ordering rings from any ring manufacturer to specify the exact WBO ring colour and the Pantone Code as well as the ring specification to avoid any misunderstanding by ring manufacturers. The same ring colour code also applies for the Colour Budgerigar


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