Open design, different feel
The central opening distinguishes tunnels from solid plugs. The outer diameter still determines the required insertion size, while the opening affects the design and possible access.
Measurements matter
Check maximum outer diameter, insertable length and neck. Do not estimate suitability from product photos alone.
Material and stability
Flexible tunnels can compress slightly during insertion, while metal or other firm models keep their shape. The base must remain securely outside the body.
For prepared, controlled use
Use plenty of compatible lubricant, insert gradually and stop if discomfort becomes painful. Clean all edges and the inner opening according to the instructions.