Thermoplastic elastomers (TPEs) are generally a combination of thermoplastics and elastomers. They exhibit properties of elastomers but can be processed like thermoplastics. The most important feature of TPEs is recyclability of scrap and rejects in manufacturing process as well as of used TPEs products [1]. On the other hand, easy recycling and repairing is the factor that emphasis the use of thermoplastic elastomers over conventional thermoset rubbers.   The main goal of this study was investigation of variation of the friction coefficient and wear in the cycling friction test (ball on flat) for different kind of rubber and rubber concentration. The investigated blends are mixtures of Polypropylene (PP), natural rubber (NR) and styrene-butadiene rubber (SBR) presented in tab.1.     Tab.1. Blends composition.   Nr     1         (%) 2 (%) 3 (%) 4 (%) 5 (%) 6 (%) 7 (%) 8 (%) 9 (%) 10 (%) 11 (%) 12 (%) 13 (%) PP 100 0 0 0 50 50 50 75 75 75 95 95 95 NR 0 100 0 50 50 0 25 25 0 12,5 5 0 2,5 SBR 0 0 100 50 0 50 25 0 25 12,5 0 5 2,5   The well-known fact is that friction coefficient (COF) differ significantly for rubbers and polypropylene. The aim of present work is to understand how the mixture of materials with different COF will behave from tribological point of view.     The ball-on-plate tests were performed on a micro-friction machine (UMT-3 Bruker company) offering friction evaluation and wear testing facilities. Wear tests were carried out in air at room temperature using a stainless sill ball of 2 mm diameter sliding against TPRs materials. Experiments show a considerable increasing of COF for PP/rubber blends even for 5% concentration of rubber.