Knee Boards Stainless Steel Lightweight 28 x 8-inch (Pair) are made of #18 gauge stainless steel. These contoured sliders prevent digging into the concrete. These durable sliders are easy to use to protect your concrete while finishing. Toe bracket secures the foot and allows for ease of back and forth movement along the work surface. Each slider features an adjustable knee pad to provide comfort on your knees as you move around the cement. The lightweight polyurethane knee pads are removable/replaceable. The knee pads securely attach to knee with two adjustable web straps to hold pads to knees. Each pad is molded in one piece to eliminate seams that can lead to chafing and discomfort. Remove the knee pads and use them on their own for additional versatility. The knee pads are replaceable to extend the life of the sliders.