Eco Union have finally filled a gap in the market that has been crying out for an eco alternative for years! I don't think I have ever seen eco painting tools and accessories in my life, even as a kid so I know you're all going to LOVE their range! Not only that, they are made in the UK, B CORP certified AND they plant trees!! Angle sash brushes are designed for tight spaces and neat lines, great for window/door frames and getting into all the nooks. Eco Union is handcrafted here in the UK by three generations of brush makers, made with care and designed to last a lifetime with a secret filament assembly that only brush geeks would understand!