A British company has created a "goo-like" substance to "toughen up" smartphones and its accessories.
Tech21 has created a gel called D30, which looks like children's toy silly putty, but can be used to make smartphone accessories stronger.
In a demonstration at CES in Los Angeles last week a representative from Tech21 wrapped his finger in the goo and then hit it with a mallet without harming himself to prove the effectiveness of the product.
Apple stores are already selling mobile phone cases with the gel
featured on the sides of the case.
D3O materials in their raw state flow freely when moved slowly, but on shock, lock together to absorb and disperse energy, before instantly returning to their flexible state, the company said on its website.
Tech21 says it manufactures military-grade protection for phones, tablets and e-readers.
The patented gel was invented by British scientist Richard Palmer after a skiing accident in 1999.
The company is also preparing screen protectors using a similarly strong material, the BBC reported.