Reviews : AK Size 4 Synthetic Round Brush AK Interactive Size 4 Synthetic Round Brush $4.19 Leave a Rating! ★ ★ ★ ★ ★ OR Write a Review! Write a Review Sort 5-Star: 1 (1 ratings) 4-Star: 0 (0 ratings) 3-Star: 0 (0 ratings) 2-Star: 0 (0 ratings) 1-Star: 0 (0 ratings) Reviews Good Value By: Gsd76 AK synthetic brushes are durable and hold their points well. I use these brushes with acrylic, enamel and lacquer. After cleaning with the appropriate thinner, I always do a final clean with warm water and Dawn soap. Recommended. (0)