On The Run OTR.008-S Superflow Empty Squeeze Marker 18 mm FOFS which keeps lead from advancing

which keeps lead from advancing accidentally while it's loose in a bag or pencil case

absorbing the shock instead of letting it crack the core

water-based ink and trace lines that are 2 - 5 mm wide

more pressure for a broader stroke up to about 4

On The Run OTR.008-S Superflow Empty Squeeze Marker 18 mm FOFS which keeps lead from advancingThe OTR. 008 S Empty Superflow squeeze marker comes with an 18mm round nib and 60ml squeezable body. Unscrew the lid, pop out the nib, and fill it with OTR. 901 Soultip paint, Hard To Buff ink, or any OTR refill you're running marker paint, Flowpen ink, whatever works for your setup. Squeeze pressure controls your flow. Press hard for thick output, ease up for thinner lines. 60ml capacity is smaller than the 90ml markers but still holds enough for