Evans-UBD20RB 20-Inch Black Vellum

One patch resonator Hype By Evans , EQ series , black color.The EQ of One by Evans , patch is made of a layer with inner flap . It is aggressive and warm, with a powerful solid, has a low attack and controlled sustain. A special patch that makes it extra strong , with a layer of 10 mils.

https://www.oosthavens.co.za/product-category/drums-percussion/vellums/