'The Mike Dowling Signature' Bottleneck Slide; One of the worlds consumate guitar teachers, performers & recording artists, Mike Dowling personally endorses these specially-commisioned 'Mateús Rosé (R) genuine bottleneck guitar slides, beautifully hand-crafted by our team at Diamond Bottlenecks. Exceptionally thick-walled heavy green glass, totally de-seamed & finished with our trademark 'rolled 1/4 round' cut profiles, then diamond polished to jewelry standard using fine-grade micron paste resulting in a lustrous, flawless mirror finish hard-glaze shine, this bottleneck slide offers unrivalled tone & sustain over other available glass bottleneck alternatives - this is Mike's personal choice of guitar bottleneck. We are able to offer internal diameters from 17.5mm (11/16" - U.S. ring size 7 1/4), up to 18mm (46/64" - U.S. ring size 7 3/4") at the smaller end of our 'Mike Dowling Signature' bottlenecks, with a maximum slide length obtainable of 2.1/2". All of our ‘Signature Series’ glass guitar slides are individually packed and shipped complete with it’s very own ‘Mojo Bag’ for constant protection, and a promotional C.D. of our endorsees subject to availability.