TN 385936 36" Proex Checkerboard Pattern Pre-Sweep Main Broom for Tennant 8300 Sweeper/Scrubbers. Proex is a blend of 3 different diameters of X-shaped polypropylene filaments. Proex brooms are great as sweeping and pre-sweep brooms on floor scrubbers. These brooms can pick up light to moderate debris. This broom has an open checkerboard pattern, similar to the window broom offered by Tennant, which is suited for larger debris. Fits Tennant 8300 (MP 1000 and MP 1200) series riding sweeper/scrubbers. Priced Each. Replaces Tennant 385936. Our Part Number TN 385936