Mindwave : Sketch Space Letter set Sale! from $5.95 Qty available: 1 Qty. Add to Cart This letter set by Mindwave Japan is awesome!! It includes 10 sheets of writing paper, 5 gorgeous illustrated envelopes, plus 5 envelope seals/stickers. Measures : 18cm x 13.5cm Official Mindwave product, Made in Japan. More products from Mind Wave Tweet