The Broadfix Levelling Shims have been manufactured with a high percentage of post-industrial and post-consumer recycled material. As they are made from plastic they will not swell, shrink or rot and they are completely waterproof. Capable of withstanding higher compressive loads than traditional timber levelling shims. This also makes them more economical. They are colour coded depending on size, for easy identification. This Broadfix Levelling Shim Mixed Set contains four of the most popular shim styles 30 x Standard U Shims 101 x 43mm. 70 x Small U Shims 55 x 43mm. 15 x Precision Wedge Shim 78 x 45mm. 45 x Flat Packers 100 x 28mm.