W&P
Specs clearly published wandp.com ↗
W&P is a design-first brand rather than a plastic-free one, but the Peak ice tray is built the right way: food-grade silicone with an internal steel frame for structure and a fitted silicone lid. Nothing that touches the ice is hard plastic, landing it at silicone-only. It's a solid pick for anyone comfortable treating food-grade silicone as an acceptable non-plastic material.
How clear are their specs?
The Peak tray's materials are stated plainly - food-grade silicone with an internal steel frame and a silicone lid - so there's no ambiguity about what the ice touches.
