Rear sprocket Question


Needing to buy a set of rear sprockets for my 6 year olds kart. We don't have to have the best , just wondering what u guys run or your opinion on them. See a lot of advertisement for RLV . Any one have info on these. As far as fitting , performance , durability.
rlv is fine, rocket are nice hortsman good. have most of all brands, occasionaly get a bad one though its usually some odd ball picked up at swap meet