Tantus 6.25" Mark O2 Silicone Dual Density. An average sized, harness-compatible dildo made of Tantus’ Ultra Premium 100% Silicone Dual Density O2 material and boy does he feel real. Features a super soft outer layer of silicone and a dense inner layer, specifically designed to deliver maximum satisfaction through a realistically familiar feel. We’ve created a thicker base for added stability when used with a harness with lifelike veins on the shaft for extra pleasure. It has a slight curve for added g-spot satisfaction and features an exaggerated head for effective stimulation. There’s nothing else on the market that feels as realistic.