It is an eye catching, colourful cactus. You can see it looks like colour dye was injected into the plant, like the floral industry does to white orchids and mums. The clear (white) pricks will show whatever the colour dye was for a period of time, this one is purple. Through time, the aged part near the root already shows its true colour. Still it is very interesting visually.
They have a neon rainbow colour theme: red, orange, yellow, green, blue and purple.