Tom's Studio Lumos Spare Ink Reservoirs Refills Single & Duo/Mini Type:Lumos Single Refill which releases the middle piston

which releases the middle piston rod's shut-off mechanism

Easy to ink: Come with a converter

Water based ink won't dry out due to a humectant ingredient in the ink that draws water into the tip from the air

black or silver

Tom's Studio Lumos Spare Ink Reservoirs Refills Single & Duo/Mini Type:Lumos Single Refill which releases the middle pistonSpare ink reservoirs for your Lumos pen. These high quality fibre core reservoirs are designed to provide smooth and reliable ink flow, ensuring a seamless writing experience. Keep spares at hand so you can easily switch between colours without any hassle. Lumos Pro Duo and Mini Reservoirs: Pack of 5 Size: 6mm x 42mm Lumos Pro Single Reservoirs: Pack of 3 Size: 6mm x 91mm