These models are part of the "KontinuumLAB Instrument Kit" project. These keys consist of 2 pieces each, and assemble (with a bit of copper tape, and electrical tape) into capacitive sensors for my K.L.I.K. wind instruments. There are several variations of the basic key concept: There are 3 different sizes, as well as a slanted version of all of them for an angular key. There is also a version with a curved bottom, to go onto tube shaped instruments. I've been working on MIDI wind instrument keys for years, and these work really well and look great too! For full description / explanation, go to the KontinuumLAB YouTube channel: https://www.youtube.com/channel/UCSvGhrAVvAKpWMsooCTBWZQ. This is the video about the KLIKsophone wind instrument specifically: https://youtu.be/M3CBpWtfdIo All of the KLIK instruments are meant to be built using the KontinuumLAB Instrument Kit electronics. The use of 3d printed parts is optional, all instruments can be hand-made as well. I will be selling the "K.L.I.K." kit, as well as instruments based on it, in the webshop at: www.kontinuumlab.com The 3d-printable parts include: mouth pieces, breath sensors, self-flexing melodica keys, wind instrument keys, structural pieces, end pieces for making boxes, membrane instrument "drums", string instrument fret-board sensor bases and even a fully 3d-printed MIDI ocarina. The KontinuumLAB Instrument Kit is still under development, more detailed descriptions, as well as updates and more designs will be published right here.