| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| best pencil lead hardness for writing | 1.17 | 0.5 | 961 | 20 |
| pencil lead hardness guide | 0.57 | 0.4 | 3163 | 45 |
| pencil lead hardness ratings | 0.2 | 0.2 | 5865 | 93 |
| hardness of pencil lead | 0.63 | 0.8 | 7286 | 1 |
| types of pencil lead hardness | 1.05 | 0.2 | 2479 | 76 |
| pencil lead hardness chart | 1.37 | 0.3 | 3308 | 53 |
| hardness of lead pencils | 1.69 | 0.2 | 2404 | 78 |
| best pencil lead for writing | 0.01 | 0.7 | 6320 | 75 |
| difference in pencil lead hardness | 0.77 | 0.8 | 7168 | 90 |
| lead pencil hardness grades | 0.07 | 1 | 751 | 88 |
| best mechanical pencil lead size for writing | 1.07 | 0.4 | 5387 | 61 |
| pencil hardness versus lead alloy hardness | 1.99 | 0.1 | 2128 | 99 |
| pencil test for lead hardness chart | 1.81 | 0.4 | 1529 | 27 |
| pencil lead hardness chart and darkness | 0.2 | 0.9 | 2066 | 37 |
| lead hardness scale for pencils | 0.32 | 0.5 | 9470 | 2 |
| lead pencil grade softest to hardest | 1.32 | 1 | 7110 | 33 |
| mechanical pencil lead hardness | 0.36 | 0.3 | 7974 | 58 |
| pencil lead hardness scale | 1.87 | 0.3 | 8202 | 69 |
| mechanical pencil lead hardness chart | 0.27 | 1 | 9899 | 3 |
| lead hardness testing pencils | 1.57 | 0.6 | 4712 | 33 |
| what is the hardest pencil lead | 0.31 | 0.6 | 2724 | 36 |
| which pencil lead is hardest | 0.74 | 0.1 | 5289 | 91 |
