The Whistle collection is based on the shape of a blowpipe, also referred to as a glassmaker's whistle. The transparent and coloured part fit seamlessly. The hand-blown glass faces downwards and shows the pure craftsmanship of Czech glassmakers. The Whistle is available in two sizes, small and medium or a set of three lights. The sculpture is available in five special colours. The Brokis designs are true gems of glass, at least 30 people take part in the production process.