1、The breadboard is made of ABS plastic, very durable to use 2、Each row and columns has corresponding letters and numbers, reduce the mistake handling 3、With tight plug-in contacts, the components will sit well after assembly and nothing will wobble 4、Self-adhesive back tape makes it easy to stick on a platform, like the prototype shield 5、Solderless breadboard is convenient for the prototypes and circuit design experiment and other DIY projects Features: The breadboard is made of ABS plastic, very durable to use. Each row and columns has corresponding letters and numbers, reduce the mistake handling. With tight plug-in contacts, the components will sit well after assembly and nothing will wobble. Self-adhesive back tape makes it easy to stick on a platform, like the prototype shield. Solderless breadboard is convenient for the prototypes and circuit design experiment and other DIY projects. Specifications: Material: ABS Color: White Quantity:3 pcs Number of hole: 400 Holes Length: Approx. 8.5cm / 3.35inch Width: Approx. 5.5cm / 2.17inch Weight: Approx. 38g Package Included: 3pcs x 400 Holes Breadboard Note: Only breadboards, no other stuff included.