Protobloc Prototyping Board. A fast and economical method of circuit construction and development. Solderless which allows components to be re-used. Sockets are on a 2.54mm matrix, allowing all dual-in-line integrated circuits, plus many other components to simply be plugged into the board. Total of 390 tie points, two sets of 25 rows of 5 interconnected contact sockets on each side of the block and 4 rows of 25 interconnected sockets in the centre. Can accommodate up to three 16-pin devices.