This tuning kit has many more features than the standard tuning kits that have been available so far. Contains 5 sets of 16×13 weights instead of the usual 4. The tuning range is right in the 4-stroke engine RPM/performance spectrum, between 5g and 6g. This means that every 4-stroke CVT can be fine-tuned. Contains: 5g, 5.3g, 5.8g and 6g weights. The weights can be left in place for a long time without having to be replaced. This saves time and money, and all you have to do is tune the CVT and ride. There is no need for additional shipping costs. This justifies the slightly higher price. Of course, this kit can also be used on all 16x13mm 2-stroke CVTs.