HKK Vertex Silver track racing chain (NJS)

The Vertex Silver chain from HKK, Japan.
The chain links alternate between chrome plated and black.
NJS approved for use in Japanese pro keirin track racing!
This is a 1/8 size chain, standard track bike type.
Beautifully finished, super-tough race chain, with small NJS stamps on the chain links.
This chain uses a quick-link system, like all NJS certified chains.
The HKK blue, gold, and silver chains are all the same, apart from the color finish.