These magnetic bicycle lights by Copenhagen Parts turn on as soon as they come into contact with the steel frame.

The magnets mean it's easier to take the lights with you when leaving the bike chained up and also enable them to be positioned anywhere on the frame.

They contain battery-powered LEDs and come in machined aluminium or coloured silicone finishes.

You might also like the Bookman LED bicycle lights that attach with elastic bands, especially if your bike's made from anything other than steel.

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Here's some more information from Copenhagen Parts:

Steel is real – magnetic bike lights

Scandinavian Winters are dark, cold and long so we get the importance of good bike lights. The trouble is that there are hardly any good looking bike lights. We wanted something that looked good, worked well and, most importantly, could be fitted and removed instantly. The answer was obvious – magnets.

‘We had the idea some time ago and have spent the last 18 months getting them right. We now have them perfected and will soon be ready to launch this patented innovation’ says Copenhagen Parts co-founder, Lars Thomsen.

Mads Kjøller Damkjær, co-founder in the company, adds ‘magnets and steel tubes are an obvious match but we’ve spent a lot of time working on selecting the right components and perfecting the details so that they will fit to different tube diameters and stay there’. And the cleverness doesn’t end there. The lights turn on when placed on the bike and automatically switch off when removed.

‘We have been riding with the prototypes for 6 months. They are so easy to fit anywhere on the frame and they stay put – regardless of the road surface. And they just pull off to keep them out of the grasp of thieves’ says Anthony Forsyth, bike-geek and one of the designers for Copenhagen Parts.

Ok. They only work with steel frames but with the vast majority of people still riding steel-framed bikes there’s an ample market. For steel frames, they work outstandingly. For other materials, you’ll have to look elsewhere. Sorry, but that’s physics for you.

We are launching two versions – Randonneur and Lode. Randonneur has a body of machined aluminium and is polished to give a very classic finish. Lode has a silicone rubber outer, available in a range of striking colours.

‘Both versions come in a small and cool package, made from recycled materials, that can be used to store the lights and to display them in-store’ says dis- tributor and production partner from Cph Odd, Jacob Guldager.

Both are extremely compact and use battery-driven LED light sources. The lens is designed to illuminate from the sides as well as straight-on to increase visibility. The fact that they can be placed anywhere on the frame without fittings also makes it possible to use multiple sets to further aid visibility to other road users.