Just a few notes about mechanical pencils I own.

Pentel GraphGear PG-519

Quality construction with an excellent medium-rough knurled and grooved metal grip.

The metal grip sits proud over a good quality plastic barrel. You think it’s going to be very tip heavy, but it’s actually quite well balanced. Good hardness indicator, removable clip and standard eraser within, but no lead cushioning and no fancy features.

The model name and the 4mm lead sleeve make it clear that this is aimed at graphing, but I find it a delight to write with. £10.50 from Cult Pens.