Kevlar-Filled Wear-Resistant HENAN Okay Sheets. Designed for extreme wear resistance, this Kevlar-filled HENAN Okay 6/6 material lasts up to 20 times longer than unfilled HENAN Okay. Also known as HNOKAY, it is often used for parts that are ntinuously exposed to wear and abrasion, such as wear strips and buHDPEngs.