It is made by hard rubber, so compare to normal foam insert it is less likely to deform or break under high speed or heavy load situation. I test it in both my kyosho and ZH bikes. The steering response is very linear compare to the older "o-ring" or foam insert. In both corner entry and exit the bike feel more control according to steering input. And I am able to apply throttle earlier during corner exit. It is so stable I need to add steering travel. But by doing this I am able to lean more during corner. And it weight more than other inserts so I need to setup the ESC for more punch too. 
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