We present the open design of the PIRATE, an anthropometric earPlug with exchangable microphones for Individual Reliable Acquisition of Transfer functions at the Ear canal entrance. Its outer shape is available in 5 sizes and provides a deep, tight and reproducible fit in virtually all human ears. The design includes a recess to accommodate a MEMS microphone. Thus, the same microphone can be conveniently used in different earplugs without losing accuracy, and the microphone can be removed for calibration. The PIRATE or previous versions of it have been utilized in several studies with more than 200 subjects From the provided model, the earplugs can be 3D printed, and only minor working steps are necessary before use. These steps are described in the documentation. Reference: Denk F., Brinkmann F., Stirnemann S., Kollmeier B. (2019) "The PIRATE: an anthropometric earPlug with exchangeable microphones for Individual Reliable Acquisition of Transfer functions at the Ear canal entrance," Fortschritte der Akustik - DAGA, Rostock, Germany

{"references": ["Denk F., Brinkmann F., Stirnemann S., Kollmeier B. (2019) \"The PIRATE: an anthropometric earPlug with exchangeable microphones for Individual Reliable Acquisition of Transfer functions at the Ear canal entrance \", Fortschritte der Akustik - DAGA, Rostock, Germany"]}

Funding: Funded by the Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 352015383 - SFB 1330 HAPPAA A4, Cluster of Excellence Hearing4All and Forschergruppe SEACEN.