Mark is an average sized, harness-compatible dildo made of Tantus Ultra Premium 100% Silicone Dual Density O2 material and boy does he feel real. Mark features a soft outer layer of silicone and a dense inner layer, specifically designed to deliver maximum satisfaction through a realistically familiar feel. Weve 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. Theres nothing else on the market that feels as realistic as Mark.