YOU ARE BIDDING ON A : Original Norelco Reflex Plus 6 Replacement Razor Heads HQ55 Plus They fit Norelco Reflex Plus 6 Razor Models only These Replacement heads fit models using Norelco HQ55 Reflex Plus heads, including 6423LC, 6424LC, 6613X, 6614X, 6615X, 6843X, 6853XL, 6863XL. only Very simple insructions on how to change the heads on back of pack.. Package contains 3 Cutters & 3 combs.. For the best cut it is wise to replace the heads once a year under normal use.. THANKS FOR LOOKING !!