This is our remake of the classic "Chocolate Bar", known from the movie "Apocalypse Now" where Captain Willard, played by Martin Sheen, had such a strap on his Seiko 6105.
Our new rubber straps are made of TPU rubber, a material that is a little stiffer than silicone, but feels more solid, it also has a glossy finish and is treated with dust repellant unlike many dust magnets out there.
Measurements: 21,5 cm in length (12.5 cm x 9 cm including the buckle) and about 4 mm thick. The strap width at the buckle is 2mm less than the spring bar width.
Material: TPU with a stainless steel buckle.