Love the effect of these Pilot color-changing pens! (they work like Frixion pens) : r/pens

Pilot FriXion Ball Knock Retractable Erasable Gel Ink Pens,Fine Point, - 0.5 mm - Blue Ink- Value Set of 5 & 6 Gel Ink Pen Refill Pack

Advanced technology liquid ink. Long-lasting performance up to 8 000 feet. Water-resistant ink dries quickly.

Pilot Precise V7 RT Retractable, Black Ink, 0.7mm Fine Point, 3 Pens with 4 Packs of Refills

Stress-Free Writing: Write, draw, erase & rewrite repeatedly without damaging your documents & illustrations; Unique thermo-sensitive ink disappears

Pilot, FriXion ColorSticks Erasable Gel Ink Pens, Fine Point 0.7 mm, Pack of 16, Assorted Colors

Why People Love Fountain Pens

Pilot FriXion Colors Erasable Marker - 24 Color Bundle

Are erasable pens worth it? - Quora

One more for the community's exploration of #21PenQuestions — mnmlscholar

G2 Premium Gel Pen, Retractable, Fine 0.7 mm, Black Ink, Smoke/Black Barrel, 2/Pack - Office Express Office Products

Exciting Pens, Highlighters, and Markers that can be Used with Rocketb – Rocketbook