LokoCar provide the orb adapter 6-month warranty. size :the thread size of 8AN is 3/4-16 UNF,the thread size of 10AN ORB is 7/8-14 UNF. Material : The 8AN to 10AN orb reducer is made of aluminum alloy 6061-T6 which is anodized black surface,and the O-ring is made of NBR rubber.