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Gas detector are very light instrument used in high energy physics to measurethe particle properties: position and momentum. Through high electric field ispossible to use the Gas Electron Multiplier (GEM) technology to detect thecharged particles and to exploit their properties to construct a large areadetector, such as the new IT for BESIII. The state of the art in the GEMproduction allows to create very large area GEM foils (up to 50x100$\mathrm{cm}^2$) and thanks to the small thickness of these foils is itpossible to shape it to the desired form: a Cylindrical Gas Electron Multiplier(CGEM) is then proposed. The innovative construction technique based onRohacell, a PMI foam, will give solidity to cathode and anode with a very lowimpact on material budget. The entire detector is sustained by Permaglass ringsglued at the edges. These rings are used to assembly the CGEM, together with adedicated Vertical Insertion System and moreover they host the On-Detectorelectronic. The anode has been improved w.r.t. the state of the art through ajagged readout that minimize the inter-strip capacitance. The mechanicalchallenge of this detector requires a precision of the entire geometry withinfew hundreds of microns in the whole area. In this contribution an overview ofthe construction technique, the validation of this technique through therealization of a CGEM, and its first tests will be presented. These activitiesare performed within the framework of the BESIIICGEM Project (645664), fundedby the European Commission in the action H2020-RISE-MSCA-2014.

Test beam results of a Cylindrical GEM detector for the BESIII experiment