GMK Hammerhead is designed to support nearly all keyboards out there, from HHKB layouts, to Ortholinear layouts, we are sure you will find your fit. The GMK Hammerhead Group-Buy comes with 5 Kits, you can look at the following kits below. The kits have been designed with making Minimum Order Quantities set by GMK in mind, this Group-Buy has a larger than standard selection of sets. Many keys have been re-grouped over the development of the set to make sure that the Group-Buy will be succesful.