Purchasing a lyra with no rigging is best if you already have your carabiners and swivel.
Basic rigging includes 2x steel carabiners and a swivel – this is enough for most setups.
Pro rigging includes two autolock carabiners, a maillon and a swivel. This is best used for those who need to put their lyra up and down often and easily and is a little quicker to assemble.