A 2.5 centimetre plastic buckle collar can be seen in the picture. It is made up of welded metal parts and a strong technical quick-release buckle. The textile part is made up of a strong, ribbed polyester webbing and a hard-wearing, patterned ribbon. For more information on the type of collars, see here
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* Halley wears 2.5 cm wide, S1 sized collar.