Kuryakyn Mechanical Throttle Cruise Assist (EA) PN 6285

Looks like a bar end weight

Spring-loaded tensioner inside holds the throttle in position once you set it with your little finger

Easy throttle shut-down -- just roll the throttle forward to disengage

Optional matching clutch bar end weight available separately

For use with OEM or Kuryakyn ISO, Flame or Transformer grips

Proper installation may require cutting a 3/8" hole in the end of your OEM grip

Handlebars must have open ends