To ensure sufficient stock of suitable hearing protectors is available, Howard Leight offers two convenient ways to keep your dispenser full. Choose pre-filled canisters of 400 earplugs, or zip top bags of 200 earplugs to refill the dispenser. Earplug dispensers offer a cost-effective solution to outfitting many workers with hearing protection, saving money while eliminating waste. The canisters are a level 7 blow-molded recyclable plastic, which can be recycled just like a water bottle, making it an economic benefit. To be more environmentally friendly, choose the zip top bag of earplugs, and refill your stock by reusing the canister. Contoured bell shape for easy insertion. SLC80 26dB, Class 5 REFILL & ASSEMBLY Step 1: Remove canister from dispenser case. Turn upside-down and them remove the empty canister lid. Swap out empty canister for a new prefilled canister. Step 2: Once the canisters are swapped out, snap canister lid back onto canister. You will hear a click sound to assure it is back in place. Step 3: Flip canister right side up and gently insert back into dispenser base. Arms of dispenser base will click when canister is properly inserted.