Hassle-free Service: We value every after-sales problem, if you encounter any problem in using, please feel free to contact us, we guarantee to give you an optimal solution. 3 Step Use: Simply open the buckle strap, snap the razor to the top of the attachment and make sure the front of the blade is flush with the green guard. If the razor should ever fall off, easily follow the instructions to reattach it. Safe Durable: These clipper guards are made of high-quality PC and TPU material, which are not only durable for long lifetime use but safe for your skin. The inner structure is tested repeatedly for precise length position. Compatible Models: This adjustable guide comb is compatible for One Blade shaver QP2520 QP2530 QP2630 QP2724 QP2824. The package includes 14-in-1 adjustable comb 1, click-on skin guard 1, click-on body comb 1 and small cleaning brush 1. 14 Lengths Optional: This is the latest design of guide comb guard set for Philips One Blade. Adjustable size for 14 length from 0.4 to 10mm. You don't need to buy any other pieces guide combs for different sizes. Just own this one!.