The BIQ Laser cut Sanguinololu mount board & Prusa print bed Kit (4mm MDF) contains:

1 x Sanguinololu 1.3a PCB (as described below).
1 x MDF Sanguinololu / Ramps mounting board.
1 x MDF 50mm Fan mount.
1 x MDF Prusa Sub bed board.
1 x 4mm MDF Prusa Print bed board.
1 x Fix It Block
3 x 4mm 20mm long Screws
3 x 4mm nuts
4 x Brass PCB Stand Offs
4 x 3mm 6mm long Screws

This kit is designed to accommodate the modified design of the Prusa Mendel to take a PCB Heatbead Mk1. The parts replace the following (listed for the Prusa Mendel):

225mm×225mm print top plate

140mm×225mm print bottom plate

Prusa Print Bed as shown on Thingiverse

PCB mount details can also be found here

Sanguinololu 1.3a PCB details include:

1.6mm thick MR4 0.5 OZ copper Double Sided (DS) with Plated Through Holes. (PTH)

Lead free RoHS compliant and have been 100% electrically tested. Electrical testing is indicated by marks on the edge of each board.

From the reprap wiki and corrected for the 1.3a version:

Features

Small design – board is 100mm x 50mm (4″ x 2″) – barely an inch longer than a business card!
Sanguino clone, Atmel’s ATmega644P – ATmega1284P drop-in compatible!!
Up to 4 Pololu (or Pololu compatible) on-board (X,Y,Z,Extruder) (A4983 / A4988 without voltage regulator) or the A4988 Step Stick version note Step Stick version have a different current setting
Supports multiple power configurations
– Logic & Motors supplied by ATX power supply (needs 4pin atx connector for 12v/supply voltage)
– Motors supplied by 5mm screw terminal 7-35V
– Logic supplied by USB bus
– Logic supplied by optional on-board voltage regulator.
– Supports multiple communication configurations
– FT232RL on-board for USB connectivity
– USB2TTL header is available for FTDI cable, or BlueSMIRF bluetooth module
2 connections for Z stepper motors for Prusa builds
2 thermistor connectors with circuitry
2 N-MOSFETs for extruder/bed, or whatever
Solder link Selectable 12v(or supply voltage)/5v endstop voltage
Edge connectors enabling right-angle connections
Silkscreen for connectors on both sides of the board, facilitating bottom cable connections
13 Extra pins available for expansion and development – 6 analog and 8 digital, with the following capabilities
– UART1 (RX and TX)
– I2C (SDA and SCL)
– SPI (MOSI, MISO, SCK)
– PWM pin (1)
– Analog I/O (5)
All through-hole components (except FTDI chip) for easy DIY soldering

Please note when adding the order number to the silk screen I accidentally deleted the “a” from the 1.3a.