Plastic Grecian-style cake pillars are specialized, structural, and decorative supports designed for tiered cakes, offering a classic Roman or Greek aesthetic. They are commonly used in wedding and formal event cake construction to add height and stability between tiers. 

Key Features and Description:

Design & Style: They feature a "Grecian" or "Ionic" style, characterized by being elegantly scrolled, ribbed, and tapered for a classical, artistic look.

Material: Made from durable, food-grade plastic, which is generally white, though some may have a pearlescent finish.

Structure: They are typically hollow, lightweight, and designed with flat, square, or round ends to support separator plates, making them stable and secure.

Versatility: These pillars can be used together or separately for different effects. They can support significant weight, with some sets supporting up to 110 lbs, ideal for stacked, heavy cakes.

Size Options: Common heights range from 3 inches (7.6 cm), 5 inches (12.5 cm), to 7 inches (17.5 cm) or higher.

Usability: They are reusable, often dishwasher safe (top rack), and designed to be easy to set up. 

Usage in Cake Construction:

Assembly: They fit between two separator plates (one right side up, one upside down).

Spacing: The space between the pillars can be decorated with flowers, lights, or ribbon.

Stability: Often used in conjunction with dowel rods for added support. 
These pillars are popular for creating "floating" or, more commonly, elevated tiered looks, often used for weddings, anniversaries, and christenings