Hi Cameron,
Stock units are spec’d very ‘middle of the road’ to appeal to the largest amount of hair wearers. All stock units are body wave which is one step up from straight. It has a ‘bend’ to the hair. So in order to get a unit with any other curl option you would need to order a custom unit. Or, another option with a stock unit is to curl it yourself with a curling iron. The units are 100% real human hair so you could use a curlling iron or curlers to get the curl you want.
Regards,
John