The piezo is a great accessories for cello and double bass. 

Features: 
Designed for cello and double bass. 
High sensitive pickup piezo. 
Cord is 24.5cm in length. 
Plug is 2.35mm in diameter. 
A great replacement for your pickup piezo. 

Specifications: 
Cord Length: 24.5cm / 9.6in 
Plug Diameter: 2.35mm 
Package Size: 10 * 4 * 0.5cm / 3.9 * 1.6 * 0.2in 
Package Weight: 8g / 0.3oz 

Package List: 
1 * Pickup Piezo