The chain is intended for : Rieju 50 MRT Supermotard / Pro 2009 - 2017
Chain size : 420
Chain length : 132

Regina 420 RX3 chain, without gasket.
Tensile strength is 21kN
Weight 0.82kg - 100 links

Developed to withstand heavy duty off-road driving
Larger diameter alloy carbon steel studs and thicker plates offer increased tensile strength and fatigue resistance
Extended bushings and solid rollers provide increased durability
Primarily intended for smaller motorcycles up to 85cc
Gold color

If you get a longer chain, it's not a mistake. Just shorten the chain.