KICKSTART YOUR RECOVERY. The Nike Foam Roller features a firm, hollow plastic core and a textured surface for an intense massage that targets specific muscle groups. Its lightweight, portable design lets you take it wherever you put in the work. [] Product Details:13\ long. 5.5\ diameter. 60% polypropylene/40% ethylene vinyl acetate. Imported. Style: N1000816; Color: Black/White/White; Size: One Size; Gender: Unisex; Age Group: Adult | Nike Recovery Foam Roller in Black, Size: One Size | N1000816-027