Ring Specification & Colour Sequence

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	Year	Year	Year
Black	Black 2U2X	8005	2002	2007		2013
Dark Blue	301 U	5019	2003	2008	2011		2017
Gold	Yellow U		2004
Pastel Green	344U	6019				2014
Violet	249 U	4008		2009		2015
Orange	1505U	2003		2010		2016
Dark Green	363 U		2005
Red	1797 U	3002	2006		2012		2018

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.

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