Description from the Manufacturer:
Heartstoppers in deadstop rubber give skaters more controlled stops with less slide! Slip no more running out of bowls + have a strong yet pliable stick for advanced toe stop tricks, stalls, and dead stops. For roller skates that use adjustable toe stops only.
Sadly, Heartstopper toe stops are NOT compatible with Impala Roller Skates or any other roller skates that use bolt on toe stops.