When you need that little bit extra in a center release buckle choose the GM-1. It has a low profile and is harder to disengage than the standard buckle. Combined with some footman's loops, this strap makes the perfect battery restraint. The buckle material is Acetyl (the DuPont version is called Delrin) which provides a strong, lightweight product with improved UV resistance over other plastics. Webbing is heavy duty polypropylene which will not absorb water and is resistant to both mildew and rot.