WE WERE USEING THE FACTORY 2 PIECE AND THEY WERE OK. BUT NOW WE ARE GOING OVER 20 POUNDS AND WE ARE HAVEING A LITTLE TROUBLE.WE HAVE TRIED AVIATION ,HURLEY,AND NOW WE WENT BACK TO ATKINS.BEFORE WE HAD PROBLEMS WITH THE ATKINS HORSE SHOEING BUT NOW THEY SEEM TO BE OK.INDIO USES THEM AND HE RUNS 7.79 IN THE 1/4 AND MAKES OVER 800 HORSE SO THEY WILL WORK JUST FINE FOR ME.FROM WHAT I HAVE HEARD MOST OF ALL THE BIG CARS FROM PR USE ATKINS.