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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

The WBO adopted in 1997 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.

Colour

Pantone Code

RAL

Year

Year

Red

1797 U

3002 2012 2018

Black

Black 2U2X

8005 2013 2019

Pastel Green

344U

6019 2014 2020

Violet

249 U

4008 2015 2021

Orange

1505U

2003 2016 2022

Dark Blue

301 U

5019 2017 2023

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.

WBO/2009

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