Corepad Mousing Surface
The Corepad is made out of toughened safety glass, 4mm thick with a perforated coating making it just under 5mm thick in total, and it's 28cm by 22cm in width and height. The glass conforms to British Saftey Standard 3193.Grey, with orange detailing, it's half-kidney shaped at the bottom edge and rounded at the top edge, one of the most common shapes for a mousing surface these days. The safety glass means that it's durable, unbendable and if it does happen to break for whatever reason, it's designed to shatter into soft-edged pieces that won't cut you.
The perforated weaved coating is very very thin, barely textured if you stroke your hands over it and very smooth for your mouse to slide over.
Saying that, Corepad also sell (separately or bundled with the Corepad) some Teflon tape called Corepad Skatez to stick to the base of your mouse, allowing it to slip over the Corepad as effortlessly as possible. Using the Corepad without the Skatez is decent in this reviewer's eyes, but the Skatez do help.
Current Corepads are also supplied with a neoprene cutout to place underneath the surface between it and your desk, to stop it slipping around. Earlier versions used tiny stick-on feet in the corners of the surface. The neoprene sheet adds to the overall height of the Corepad in use by a couple of extra millimetres.