The booster clips come in pack of 4 with 2 as red and 2 as black. 
The clips are made from galvanised steel with colour coded coating in flexible PVC and the clips include a large internal spring to ensure firm grip. 
They are often used for automotive electrical repair.
Booster Clips 100A (2xBlack + 2xRed)
                                
                                    
                                        | Item No. | Colour | Current Rating (A)
 | Length (mm)
 | Grip Height (mm) | Plating Finish
 | 
                                
                                
                                        
                                            | EC13 | Black/Red | 100 | 180 | 130 | Zinc | 
                                
                            
                         
                        
                            
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