A single DTDOT® Isometric Stencil.
Thousands of these stencils have been sold since production began, they a have been a feature of 'Designing' magazine from DATA, they are used on DATA designing courses and have been shipped worldwide due to a Kickstarter campaign in 2018.
The stencil can be used with the popular (and free) drawing course #SLAP (AKA Sketch like a Pro and works alongside the YouTube videos from the DTResources YouTube channel.