Jienk 10PCS 1/2 Inch Tube OD Pneumatic Cap Plug Fitting, PPF-1/2 Plastic Push-in Connect Fitting 1/2 OD auspowers_batchthree so you can use it Used for single 1 B00OPF1A1Y sold2024 Size:10mm*33m

so you can use it just like use a pen with ultra fine tip

5mm Ultra Fine Metal Tip Pencil Stylus for iPhone 13 Pro Max 2021 Drawing and Sketching Pen

Dual Shut-Off Valves Each DBR Tech hose splitter 2 way heavy duty faucet attachment features a built-in valve shut-off that lets you cut off the water flow to one side when its not in use

--Simon Leake

color- coding materials

Jienk 10PCS 1 2 Inch Tube OD Pneumatic Cap Plug Fitting, PPF 1 2 Plastic Push in Connect Fitting 1 2 OD auspowers_batchthree so you can use it Used for single 1 B00OPF1A1Y sold2024 Size:10mm*33m so you can use it just like use a pen with ultra fine tip 5mm Ultra Fine Metal Tip Pencil Stylus for iPhone 13 Pro Max 2021 Drawing and Sketching Pen