Soft and durable Santoprene construction is heat resistant. Low profile with aggressive texture provides a positive non-slip gripping surface. Grips can be trimmed to fit smaller rail segments. The covers are oil, solvent, heat and chemical resistant for durability. Grips are 6 ¼" long and 5/8"wide and cover 4 M-LOK slots. Black color. Made in the USA by ERGO® Grips. Not refundable if rails are trimmed.