The reason these designs are reusable is because we have inserted a small plaster-like plate in the interior. This holds the candle light source, like a votive candle or t-light, in the center for an even glow and prevents the heat from melting through the bottom of the design. (each candle comes with a votive cup and votive candles - unscented of course. Pretty cool!
The Deco and Lotus are approx. 5.5" - we suggest turning off your pool filter system while the candles are used so that they will float freely around the water. Always remove them at the end of the evening.