Spaghetti stones (travertine) are fragments of naturally occurring limestone rocks. The highly structured surface allows succulent plants like Mexican Pinguicula to root into the stone as best as possible and find strong support.
Medium = A medium stone (10-20cm).
Large = A large stone (20-30 cm)
Note: Since spaghetti stones are a natural product, the shape, color, and especially the size of the stones can vary significantly from one another.