2 in 1 Acrylic Transparent Base Plate Mount & Experiment Breadboard for Raspberry Pi 3 and Rapsbery Pi 2 B & Raspberry Pi B+ compatible with raspberry pi B+ and raspberry pi 2 B Base Plate is made of acrylic,you should take off the protection film befor you use the acrylic base plate. there are 400 pins in the Experiment Breadboard dimension of the breadboard is 8.5*5.5cm(3.3*2.2inch) it makes your experiment easier and convenient