These pieces of lifelike petrified wood guarantee a particularly natural appearance. The realistic reproduction is so convincing that you can hardly distinguish them from real petrified wood. Thanks to their extreme lightness compared to natural stones, the Timber Rocks prevent possible damage to the glass. The Timber rocks do not have any impact on the water quality and clarity of the water. Timber Rocks are suitable for the natural design of both aquaria and terraria. If you plant Timber Rocks with real mosses and plants, they look even more natural. Any build of dirt through algae for example is easily removed thanks to the easy-to-clean surface. Sizing is approximate: Small - 5 x 7 x 13 cm, Medium - 7 x 7 x 20 cm, Large - 10 x 11 x 25 cm and Extra Large - 15 x 10 x 31 cm.