PMTD takes its name from the initials of Plus, Minus, Times, and Divide — the four fundamental operations of arithmetic. With a single set of keycaps, we set out to turn math's most basic operations into a language your fingertips touch every single day. Addition, subtraction, multiplication, and division are the first operations humankind ever learned — so simple they're almost overlooked, yet they underpin every complex calculation in the world. A keyboard is no different. Built from nothing but the humblest square blocks, it can write code, shape words, and keep the entire digital world running. What PMTD seeks to express is exactly this power of building complexity from simplicity — the most elemental pieces, combined into infinite possibility.

Our keycaps are crafted using advanced 5-sided dye-sublimation technology, delivering vivid, full-color printing across every surface. Made from durable PBT material, these keycaps feature legends that are resistant to fading, even with long-term use.

This keycap set includes 130 keys and is compatible with most mechanical keyboards, supporting 60 / 65 / 68 / 75 / 87 / 96 / 98 / 104 / 108 layouts.

Sculpted and ergonomic, Cherry profile keycaps deliver a comfortable, natural typing feel. Their balanced height works perfectly for typing and gaming, keeping hands relaxed at all times.

The inspiration came by chance. As we were staring blankly at a keyboard one day, it suddenly hit us — a keyboard and mathematics are really the same thing. In the world of math, even the most massive formula breaks back down into addition, subtraction, multiplication, and division. In the world of keyboards, even the most complex program is typed out from individual square keycaps, one at a time. Both obey the same humble truth: the simplest units make up the most complex systems. Once that thought surfaced, it never let go — and PMTD was born.