made of high quality stainless 316 and machined  by ourselves.

The speaker cones fit both ECU's R-Plus and super +  and  have been machined at a 0.02 mm tolerance . 

The cones do fit ECU's MK1 compact bite alarms, but must then be attached with a small piece of double-sided tape or clear sealant.

NO ALARM INCLUDED!

Price is for one speaker cone .