Percy Coate, the developer of Coates Willow Charcoal, began experimenting in the 1960s with the willow he grew to make drawing charcoal. Following in the steps of his grandfather, Robert Coate , who bought and sold local willow crops beginning in 1819, Percy Coate worked on his technique for a numb...
| Size | Thickness |
| Thin | 3 mm to 4 mm |
| Medium | 5 mm to 6 mm |
| Thick | 7 mm to 9 mm |
| Extra Thick | 10 mm to 15 mm |
| Tree Stick | 16 mm to 24 mm |