We do NOT carry all available sizes in stock at all times. Items may take up to 10 days for delivery to us if not carried in stock. If you are under a tight schedule please call us on +353 87 7118753 and check stock levels before ordering Bellows hoses are 100mm long and have 2 convolutions reinforced with 3mm diameter stainless steel rings. From 51mm to 83mm diameter all bellows hoses are manufactured from 4 ply construction with a minimum wall thickness of 3.5mm. From 84mm to 102mm all bellows are manufactured from 4 ply construction with a minimum wall thickness of 4.5mm. Burst pressures are rated at 4:1 of safe working load. Separate test sheet results available. All silicone products are manufactured under the ISO 9001 quality system. Certificate No.07103Q10016ROM