Natural high grade corundum stone materials?? stone dimensions: 7" x 2 1/3"W x 1 1/4"H</br>The #1000 grit stone is the basic sharpening stone. when sharpening knives?? it is important to use medium stones and finishing stone. However?? it is easier to use a #3??000 grit stone as a buffer in between?? rather than jumping from a #1??000 grit stone to a #6??000 grit stone</br>Cutting oily ingredients leads to shorter edge retention. If you are planning to cut meat such as chicken?? it is best to stop at the #3??000 grit stone. Although?? the #6??000 grit stone will give you a more refined edge?? it will also be more prone to dulling