PCB Board: 30 pieces double sided PCB prototype boards in 4 different sizes, 8 pieces 2*8cm, 8 pieces 3*7cm, 7 pieces 4*6cm and 7 pieces 5*7cm PCB boardsHeader Connector: 10 pieces 40pin male header, 10 pieces 40pin female header; pitch: 2.54mm, single row and straight connectorScrew Terminal Block: pack of 10; pitch: 5.08mm, 5.08-301-2P, rated voltage: 300V, rated current: 16AFree plastic box: easy to storage and take outUseful: they are good components for PCBPCB Board 30 Pieces in 4 different sizes, a good assortment to meet your design demands such as electronic experiments and DIY projects. Easy to use: pre-tinned plated holes on the board make it very handy to solder components and sensors for your projects. Easy installation: 4 mounting holes at the corners of the board are very convenient for installing them together. Material: high quality glass fiber FR4 Hole-pitch: 2.54 mm Header Connector Pitch: 2.54mm, number of pins: 40pin. Type of row: single row, type of connector: straight. Great tool for Arduino proto shield. Screw Terminal Block Pitch: 5.08mm, 5.08-301-2P Rated voltage: 300V, rated current: 16A Color: greenMaterial: metalPackage Contents: 8* 2x8cm Prototype PCB universal board 8* 3x7cm Prototype PCB universal board7* 4x6cm Prototype PCB universal board7* 5x7cm Prototype PCB universal board10* 40Pin male header connector10* 40Pin female header connector10*Screw terminal blocksOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.