Car installation kit for 16 and 17cm speakers, Pioneer UD-K116 I mistakenly purchased two sets at the time of purchase, so I have kept them in storage without using them. - Brand: Pioneer - Model Name: UD-K116 - Speaker Size: 16, 17cm - Application: Car speaker installation kit Pioneer Carrozzeria speaker Sound quality improvement item, in-wall type I opened it for the purpose of taking photos, but it is unused. It's quite old.