The AddBlock is manufactured from Lycron. Each block consists of two halves which together creates a square shaped 60 mm long sealing insert. Standard AddBlocks are divided up in five sizes, 20, 30, 40, 60 and 90 mm in square. Each size consists of two or three block types and comes complete with inserts to fit five different cable or pipe diameters. Standard Addblocks are designed to seal cables and pipes with diameters from 3.5 – 69.5 mm.