I ordered 4 -4 band equalizers (flat) with Piezo rod pick-ups and 1/4" mono jack. Ordering 4 was a mistake on my part, I only needed 2. So 2 of them are for sale for $10 ea.(1 or both]+ shipping. The money is going to 2 non-profit organizations that helped me save "Hooch" (my dog) from certain death.