Glasses tumblers - porcelain stable
Porcelain on board or in the camper - completely stable
Some coffee has already landed on the floor when the yacht turned around or the camper turned. That is over now. The stable Silwy porcelain cups have a magnet in the bottom that holds them firmly on the nano-gel pad. The pad has a coating that sticks to all surfaces - and the coffee stays in the mug even when the sea is rough!