Dura blocks are the perfect blocking tool ! Dura-Blocks are ideal for wet and dry sanding. 7-piece EVA rubber block set comes in a variety of lengths and configurations to level a variety of contours and flat surfaces. Abrasive papers sold separately. Closed-cell EVA rubber creates a sanding block that provides just the right amount of support and \"give\" as you sand, wet or dry. Compared to working with sandpaper alone, these large, easy-to-hold sanding blocks help you work longer because there\'s less hand fatigue. This 7-piece set includes a variety of block shapes and sizes to help you level all types of flat and contoured surfaces, for a truly professional, show-car finish. Always wear eye, skin and respiratory protection when using Dura-Block Sanding Blocks or other sanders. Make sure you are in a well-ventilated area and follow the safety precautions on paint and filler labels. Sizes ; Largest 41cm length 7cm wide , smallest 14cm length 6.5cm  wide