SeaDek 3.75" x 12.75" x 5mm 4-Piece Step Kit - 3.75" x 12.75" Mocha Embossed - 95.25mm x 323.85mm x 5mm3. 75" x 12. 75" x 5mm 4 Piece Step Kit 3. 75" x 12. 75" Mocha Embossed 95. 25mm x 323. 85mm x 5mm Great for slippery trailer fenders, steps, and boat ladders SeaDek Step Kits are made from our 5mm thick PE EVA blended foam material. Each kit comes with four 3. 75"x 12. 75" pieces of our soft yet durable, non absorbent PE EVA blended foam material that provides excellent traction when wet or dry. Our step kits are available in a variety of colors and