The advantage of mechanical pencils is that they do not need to be sharpened like the regular wood case pencils, numerous ergonomically designed mechanical pencils are available with different colors and shapes no matter whether you use them for sketching ,drawing and or writing .
These are the ones we have available:
Staedtler Mars Micro lead size (.5mm,.3mm,.7mm,.9mm)
Staedtler Riptide lead size (.5mm,.7mm)
Pilot Color Eno lead size( .7mm)
Faber Castell-TK-Fine Varrol lead size(.3mm,.5mm.7mm,1.0mm)
Faber Castell Mechanical Pencil Gnp Plus lead size( 1.4mm)
Pentel 120 A3DX lead size( .3mm,.5mm.7mm,.9mm)