Grodan Classic Slab 30/75 12 by 3 by 36 Inch<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Gro-Slabs provide the final stage for growing a spectacularly large plant.</li><li>Transplant your Gro-Block plant onto a slab just like professional growers.</li><li>They come in clearly marked biodegradable UV resistant sleeves for comfortable handling and algae prevention.</li><li>Uni-slab - All plant roots are protected and contained for the life of the plant. Due to its size， the Uni-Slab is perfect for one large plant.</li><li>Uni-Slab has the benefits of a slab with the versatility of a block. All Gro-Slabs have vertical fibers except the 12 inch Gro-Slab， which has horizontal fibers.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41lZsjomXuL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/01%2BvUTeHoYS.png" noproxy>