1、Provide multi‑size prototype boards for you to choose from, 30 double‑sided prototype boards of 4 different sizes to meet your needs when designing your own electronic DIY projects 2、Contains 10 40‑pin male connectors, 10 40‑pin pitch right‑angle male connectors, their spacing is 54mm/0.1in, with single‑row direct headers 3、All 175 electronic components are collected in a plastic storage box, easy to store, convenient for your electronic experiments and DIY projects 4、There are 4 mounting holes on the corners of the board, it is very convenient to install, you can rest assured to use this electronic components 5、Made of ABS, there are 60 3mm light‑emitting diodes, with 5 colors of red, yellow, white, blue, and green, 12 for each color 10 x 2x8cm Prototype General Version10 x 3x7cm Prototype General Version5 x 4x6cm Prototype General Version5 x 5x7cm Prototype General Version10 x 40-pin Male Connector10 x 40-pin Pitch Right Angle Male Header12 x 3mm White LED12 x 3mm Red LED12 x 3mm Yellow LED12 x 3mm Green LED12 x 3mm Blue LED40 x Female-to-female Cable5 x 5.08-301-2P  5 x 5.08-301-3P  15 x Tactile Lid Switch Item Type: Circuit BoardCommodity Material: ABSThe Distance Between 5.08-301-2P and 5 5.08-301-3P: Approx. 5.08mm/ 0.2in 5.08-301-2P and 5 5.08-301-3P rated voltage: 300V 5.08-301-2P and 5 5.08-301-3P rated current: 16ALed Diodes: 60 3mm Light Emitting Diodes, 5 Colors (red, Yellow, White, Blue, Green), 12 for Each Color