D&D Global 13/BK109 Heavy-Duty Banded V-Belt - B Section, 13 Bands, 112in 2.7/16" What does the 8M in

What does the 8M in 1088-8M-20 mean

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"name":"D&D Global 10/BK156 Heavy-Duty V-Belt - B Section

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D&D Global 13/BK109 Heavy-Duty Banded V-Belt - B Section, 13 Bands, 112in 2.7/16" What does the 8M inThe D&D Global 13 BK109 is a standard V belt featuring Classical B section dimensions, manufactured by D&D Global. This belt features a smooth sided design for general purpose industrial power transmission. Constructed with Neoprene body compound and aramid (kevlar) tensile members for reliable power transmission and long service life. Specifications Belt Section B Sub Type Standard Width 21 32" Thickness 7 16" Length 112 in Material Neoprene