Elements Lemon Grass Jumbo Backflow Cones, 6 Tins of 20

A cardboard tray of 6 tins from Elements Home Fragrance. Each tin holds 20 jumbo lemon grass backflow cones, so you get 120 cones in total. They are handmade in India using traditional methods and are vegan. The maker gives a burn time of about 40 minutes per jumbo cone.

Each tin measures about 10.2 cm tall and 7.1 cm across. The supplier lists the weight as 115 g. Light the tip of a cone, let it catch, blow out any flame and place it on your backflow incense burner. Read the directions on the pack before use.

The effect comes from the cone. Smoke from a hollow backflow cone cools as it travels down the channel, and cool smoke is heavier than the warmer air around it, so it sinks and flows. Draughts break it up, so pick a still spot. Smoke rising? Our guide on why backflow incense isn't working covers the usual fixes.

Safety: use it on a stable, heat-proof surface and never leave it burning unattended. Keep it out of reach of children and pets, away from curtains and other flammable things, and ventilate the room.