Hole plug protective cover for standard 3.5mm audio jacks used to keep out dust, dirt, debris, and moisture. We have 5 styles for this part, see alternate part#s CBAU01CAP1, CBAU01CAP2,CBAU01CAP3, CBAU01CAP4, CBAU01CAP4B, CBAU01CAP5. Type 4 is available in black or white. Custom colors may be special ordered.