Made of firm, sturdy Pyrex, the Deep Water G is smooth to the touch. It's non-porous, hypo-allergenic, and has no smell or taste. There are five pronounced nubs running along one side of the shaft, and there is one on each side of the shaft directly under the head. They are very noticeable and might be too much for those new to texture. They are particularly good for stimulating the sensitive first couple inches of the vaginal entrance in tandem with the head providing g-spot stimulation.