"The One from the Bay"

Satisfyer puts a 15 year guarantee on its steel range, and "The One from the Bay" is the piece where that matters: 1.1 kilograms of polished stainless steel shaped into a row of spheres, 3.5 centimetres across at the widest point.

The spheres are the point here. Each one gives you a rise and then a dip as it moves, so the sensation comes in stages. Either end can go in, so you choose the depth. If you already know that pressure suits you better than vibration, this is the shape to try.

Warm it in a bowl of hot water, or leave it in the fridge, and test it on your wrist before you start. Use plenty of water-based lubricant and rock it slowly. It's rated IPX7 waterproof. Be honest about the weight, though: over a kilogram is a lot to hold at an angle, so it suits lying down.