Heat mats warm the rooting area to the ideal temperature required for speedy propagation, whether seed-germination or rooting cuttings, and these mats offer more uniform heating than others. The wires throughout their waterproof, frayproof layers deliver the durability to withstand rugged greenhouse environments, providing uniform heat distribution and eliminating hot spots. They?re hard-wearing and easy to use - just lay them directly on staging or table, then simply wipe clean and roll up when not in use. Complete with 1.8m (6\') power cable. Measurements - Small Heat Mat 25cm (10) x 35cm (14); Medium Heat Mat 40cm (16) x 60cm (24); Large Heat Mat 40cm (16) x 120cm (48).