I recently purchased the following, Weber Porcelain-Enamelled Cast Iron Cooking Grates For Q®300/3000 Series. I purchased new grates for my BBQ as food was sticking to the old grates, and by buying new, I was looking forward to cooking without food sticking to the grates. However, I have used them on 3 occasions since new, and food sticks to the grates every time, even when the grates are brushed with cooking oil to try and stop food sticking. Very disappointed with the new grates as they are very expensive, but food keeps sticking to them while cooking. Would not recommend purchasing weber replacement parts as quality does not seem to be as good as original parts.