This is a blurred gradient underwater flower shift knob. It is a mass-produced product, so it is inexpensive. The shift knob diameter (thickness) is 4.5cm at its widest point. The main body thread diameter is M12 x 1.25. The conversion adapters are a set of 3 types: m8x1.25, m10x1.5, and m10x1.25. The top and bottom are painted with a blur to highlight the flowers. The blurred paint on the top and bottom edges has a thin purple gradient. The top of the shift knob is black. The flowers are faintly visible on the top when light hits them. *I have custom painted the top myself, cutting out a round window-like shape and painting it, then applying a thick clear coat. I have many types of very glossy blurred shift knobs for sale at low prices, so please take a look.*