This selection is just a suggestion. Feel free to use any canvas of your choice. You could easily get a single canvas from a local craft store and use their 40% off coupon. Classes will be demonstrated on a 16x20" stretched cotton canvas.
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I have not tried these brushes, but the set look nice. You will want to get a 3/4" flat, 1/4" flat, a larger round and a small round for details. Make sure the brushes are recommended for acrylic paint.