It is compared with W101 of Iwatani. I bought it for compactness, but as the compactness got hurt, my hand hit the air control valve and the air volume changed. I wonder if it is better to tighten the valve. Because the inside of the paint cup is not slippery, the sticky paint will not fall even when washing the cup after construction. After all it will be wiped off with thinner. As the other one said, the lid of the cup is hard. Mr. Monotaro has stocked a set of angle cups for some reason, but usually cups are not in stock. Whatever you think, I usually think that the cup comes out, but I think that you should investigate the number of shipments etc. once around here.