This Crystal pink jelly probe has a uniquely curved tip and is a non-phallic shape. The Crystal Jellie is a Vac-U-Lock attachment. The Crystal Jellie Prober is harness compatible with plug attachment. This Probe cannot be used with O-ring harnesses. It is an interchangeable part of the Doc Johnson Vac-U-Lock sex system. It measures 8 inches in length by 1.25 inches wide with circumference of 4.5 inches around. Plug not included.