This is a MOORE-O-MATIC opener Idler Sprocket steel replacement GEAR for a A6722 MOORE-O-MATIC Garage door opener by LINEAR . This is one Gear only, For Moore-O-Matic opener models x125a,x133a,x150a,600, 616, 700 and 727 chain drive model The pic of the black gear is what your original plastic gear looks like. Some chain adjustment will be needed as the new gear is slightly smaller.
I do have some other parts available just message me as to what you need. (1127)A12,b4