2 Set Electronic Accessories: 1 Set x Prototype PCB universal board & 1 Set x Push Button Switch   8.45mm Square Momentary Action DPDT 6 Pin Push Button Switch. Self-reset switch type and panel mount mounting type. Metal and hard plastic case, With a flat washer and a lock washer.   PCB Board: 30 pieces double sided PCB prototype boards in 4 different sizes, 8 pieces 2 x 8cm, 8 pieces 3 x 7cm, 7 pieces 4 x 6cm and 7 pieces 5 x 7cm PCB boards.Header Connector: 10 pieces 40pin male header, 10 pieces 40pin female header; pitch: 2.54mm, single row and straight connector   Screw Terminal Block: pack of 10; pitch: 5.08mm, 5.08-301-2P, rated voltage: 300V, rated current: 16A   Free plastic box: easy to storage and take out. Useful: they are good components for PCB      Color: green + White + Gray   Material: Metal + Plastic   Push Button Switch:    Product Name: Push Button Switch   Pole and Throw: DPDT   Oeperation Type: Latching(Self Locking)   Total Size: 8.5 x 8.5 x 17mm (L x W x H)   Terminal Quantity: 6   Mounting Type: Flush Mount   Net Weight: 14g   PCB 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      Package Contents:   8 x 2x8cm Prototype PCB universal board   8 x 3x7cm Prototype PCB universal board   7 x 4x6cm Prototype PCB universal board   7 x 5x7cm Prototype PCB universal board   10 x 40Pin male header connector   10 x 40Pin female header connector   10 x Screw terminal blocks   20 x Push Button Switch      Only 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.