About STARTREK Exquisite Carved Hollow-out: The overall through-type hollow-out design showcases the aesthetics of subtraction through delicate carving. The most challenging part is the overall large through-type hollow-out CNC processing, which significantly increases both the machining time and the time for post-processing. Replaceable Patches: The front side features replaceable patches, offering a unique tactile experience with high and low sounds and a distinct return feeling during play. The truly fully hollowed-out design allows light to penetrate through the gaps of the machinery, shattering anxiety amidst the clicking sounds. Pleasant Sound Effects: It has unique high and low sound effects and smooth return feedback. The crisp sounds dispel boredom, presenting a unique mechanical aesthetics on the fingertips.