A 10-inch glass bong with a 40 mm joint and a single percolator is a compact yet efficient smoking device. Here's what you can typically expect from such a piece:

Key Features:

1. Size:

   • At 10 inches (25.4 cm) tall, it is portable and easy to handle while providing decent water filtration.

2. 30 mm Joint Size:

   • A 40 mm joint is larger than the standard sizes (14 mm or 18 mm), potentially providing greater airflow and better smoke volume.
   • Ensure compatible attachments if you're using other accessories.

3. Single Percolator:

   • A single percolator enhances filtration by diffusing the smoke through water, cooling it and making it smoother to inhale.
   • Common types of percolators include tree, honeycomb, or shower head designs.

4. Material:

   • Made from borosilicate glass, which is durable and resistant to heat.

5. Usage:

   • Ideal for individuals who prefer smoother hits and moderate-sized bongs.

Care Tips:

• Clean it regularly with isopropyl alcohol and coarse salt to maintain its functionality and appearance.
• Handle with care, especially around the percolator, as it's often a delicate component.