Microdata for products: weight, height, length, depth

Hello,

How could I go about describing a product's physical dimensions using
microdata: weight, height, length, depth?

An exemple, using my markup, would certainly help:

<div itemscope itemtype="http://schema.org/Product">
    <div itemprop="name">Product name</div>
    <div itemprop="description">Product description</div>
    <img itemprop="image" alt="Product name" title="Product name"
src="src.jpg" />
    <div itemprop="brand" itemscope itemtype="http://schema.org/Organization
">
        <div itemprop="name">Brand name</div>
        <img itemprop="image" alt="Brand name" title="Brand name"
src="logo_brand.jpg" />
    </div>
    <div itemprop="manufacturer" itemscope itemtype="
http://schema.org/Organization">
        <div itemprop="name">Company name</div>
        <meta itemprop="url" content="http://company_domain.com" />
        <img itemprop="image" alt="Company name" title="Company name"
src="logo.jpg" />
    </div>
    <div itemprop="model">Product model</div>
    <meta itemprop="productID" content="123-456-789" />
    <div itemprop="offers" itemscope itemtype="http://schema.org/Offer">
        <div itemprop="price">10.00</div>
        <link itemprop="availability" href="http://schema.org/InStock" />
        <meta itemprop="priceCurrency" content="USD" />
    </div>
</div>

I was looking at the Intangible class (Quantity -> Distance, Mass) to
describe a particular product's physical attributes, but could not be
positive about how to do so, if even it is the proper way.

Any help welcome.

Thank you,

-- 

François