■ Please confirm the profile ■ I am using the Kensington Slimblade Pro and have been storing this as a spare trackball, but I don't seem to have a chance to use it at the moment, so I am putting it up for sale. As mentioned in the Amazon reviews, the box says model number 303, 34mm. In reality, it is 55mm, which is compatible with the Kensington Slimblade Pro. The color is more of a reddish-purple than a pure red. Please note that the appearance may vary depending on the lighting and the environment you are viewing it in. ※Reference※ Perixx PERIPRO-304 55 mm trackball, glossy finish, red, compatible with other 55mm trackball mice 【Official warranty】(Replacement trackball