Super- Bottle Opener



French mathematician Gabriel Lamé first described the formula of the superellipse. Danish poet and scientist Piet Hein found practical use for it. Swedish architect and designer Bruno Mathsson refined it into the famous Superellipse table.

 Piet Hein:
“Things made with straight lines fit well together and save space. And we can move easily around things made with round lines. But we are in a straightjacket, having to accept one or the other. The superellipse solves the problem. It’s neither nor. Yet it is definite – it has unity.”

The Biru* bottle opener combines a superellipse and a supercircle to a harmonic figure that sits perfectly in the palm of the hand.

* Biru? That’s the Japanese word for beer. A well know example of one of many “Nipponised” English words in the Japanese language.

Made in Sweden.

  • Manufacturer Smaller Objects
  • Materials Stainless steel
  • Designer claesson koivisto rune
  • Measurements 7 × 7 × 0.2 cm
  • Lead time for stock 6 weeks
Shipping and Delivery

We dispatch all goods within the UK with DPD/Interlink, DHL/DPD for Europe & DHL for international shipments.

In the UK, prices and transit times vary depending on postcode, and how difficult it is to reach your location. We aim for UK orders to be delivered within 5 days from dispatch, but this cannot be guaranteed and some orders may take longer. CLICK HERE FOR MAP SHOWING UK SHIPPING ZONES (PDF). Please ensure you select the correct shipping method for your delivery location at the checkout.

Orders and Returns

We offer a refund on any unsuitable items, subject to our returns policy.

20% UK tax is included in the price shown. This is deducted at checkout for all non EU customers.
All EU orders may be subject to additional duties and tax when you receive your order.

If you live outside Europe, please email so we can set up a custom order with tailored shipping.

Calculate import duty & taxes for non UK customers here.

Click here to view all delivery & returns info.