Tantus first realistic vibrating O2 Dual Density toy. Alan looks and feels remarkably real. Alan also features a harness compatible base. and includes a waterproof vibrating bullet and a Silicone Suction Cup. Tantus Realistic O2 Toys feature detailed skin texture. pores. veins. and wrinkles. These Dual Density Toys are made of 100% Ultra Premium Silicone with a Super Soft outer layer and firm inner core.