MIP No.1.5 Pucks™ are a direct update for those users that find No.1 Pucks™ screws are coming in contact with the aluminum outdrives over time. By switching over to the taller No.1.5 Pucks™ it will effectively eliminate the chance of the capturing screw head coming in contact with the outdrive face during wear or articulation, since the screw head is now up and out of the way. And being that the No.1.5 Pucks™ is taller there's now more surface area for the system to spread load, which will improve overall wear. No.1 Pucks™ and pins will always be usable in a bind but we recommend the use of No.1.5 Pucks™ and pins moving forward for all Pucks™ kits (unless specified).