Prym light weight no sew press fasteners are ideal for thinner and stretch fabrics. The pack contains 20 open ring style tops, size 10mm. If you have not already got the tool to attach the snaps you will need Vairo pliers 390900. The advantage of this press fastener is that no hole has to be punched for mounting - rather the integrated serrated ring only presses down the fabric so that it is protected. Washing, spinning, cleaning and ironing for these stainless ”Jersey“ press fasteners made by Prym is no problem. Earn Loyalty Reward Points on Prym products & many more. FREE Delivery Options are also available. These press studs are not sewn to the fabric - they are attached using a hammer and the tool included - or use with the optional > Prym Vairo Pliers