HD2LC Large Razertip Flat Round Shading Pen - heavy duty.
HD2MC Medium Razertip Flat Round Shading Pen - heavy duty.
HD2SC Small Razertip Flat Round Shading Pen - heavy duty.
TH2LC Large Razertip Round Shading Tip - heavy duty.
TH2MC Medium Razertip Round Shading Tip - heavy duty.
TH2SC Small Razertip Round Shading Tip - heavy duty.