The 14mm Opaque Banger from GEAR Premium® is made of quartz and includes a flat top design with an opaque bottom for faster heating and better heat retention. Feel the GEAR Premium® difference and order one today! The 14mm Opaque Banger from GEAR Premium® is made of quartz and includes a flat top design with an opaque bottom for faster heating and better heat retention. Feel the GEAR Premium® difference and order one today!