Are formed of two basic materials – steel clops, serving as a supporting and fixing element, and vulcanised rubber layer of hardness 60 Sh. They are used for reduction of consumption of metals and labour, noise reduction and labour safety arising. They are mounted into transfer point equipment, chutes, hoppers and storage bins where crushed stones drop, or other bulk materials so to direct the impact of the dropping material perpendicularly to the reflecting plane. It cannot be recommended to use it with extremely hard materials (whinstone, etc.).