DID 219 O-Ring
The new Kart chain D.I.D. with ORING 219 V2 it has an exclusive treatment on the SDH pins (Super Dai Hard: chrome treatment on the pins) which increases the chain life performance by 30% compared to the classic HTM chain.
New silver-black version more resistant than the V1 version.
For those categories of kart:
These chains are a lot stronger than the regular DID SDH chain. Along with being stronger they do not stretch as much as the regular chain.