The chain is intended for : Derbi 659 Mulhacen Cafe 2009 - 2012
Chain size : 520
Chain length : 106

RK Takasago Chain 520 XSO2, RX-Ring.
Tensile strength is 35.4kN
Weight 1.56 kg - 100 links
Designed for medium volume motorcycle models, it lightens the weight of the chain while ensuring sufficient required force, emphasizing the light feeling of acceleration< br />Includes RX-Ring which has an "X" shaped seal that provides a double barrier to seal lubrication, provides 2x longer life than standard O-Ring chains

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