This Hasselblad Wrist Strap with H Mounting Plate for H-Series Cameras has a leather-cushioned handgrip attached to a Hasselblad Quick Coupling mounting plate.
The strap's length can be adjusted to help accommodate bigger and smaller hands, and the bottom of the mounting plate also has a normal 1/4"-20 threaded socket (in case you want to use the camera with strap on a regular tripod not fitted with Hasselblad's Tripod Quick Coupling H).