This Doc Johnson Vac U Lock Crystal Jellies, Pink Jelly Prober is one of many attachments for their famous Vac U Lock Harness systems. The Pink Jelly Prober is compatible with all Vac U Lock Harness and this one is perfect for both male and female G Spot stimulation. Made from soft translucent pink jelly, it has a silky smooth shaft and soft tip for painless penetration. The diameter of the Crystal Jellies Prober increases from 1 inch to 1.75 inches.