Due to the high density, our foam is harder than ordinary foam, so you need to push it hard into your cup and the turner arm. Different capacity: It is a 16-pen holder and 8-Pen Holder for choice,Turn 16 pens or 8 Pens at a time depends on your needs, Save your precious time and space. This is specially designed for you to make epoxy pens. Package Includes: 2 pieces turner machine foam for epoxy pens. Different capacity: It is a 16-pen holder and 8-Pen Holder for choice,Turn 16 pens or 8 Pens at a time depends on your needs, Save your precious time and space Epoxy Pen Attachment Kit for DIY Crafts Specification: Color: Black Material: EVA foam 2pcs of foams with 2 sizes Protect your Pens: Our Pen Turner foam inserts can fit the body of your Pen closely, fill the pen to keep it stable, thus the pen won't easily tilt to drop. Cup Turner Kit Pen Turner Adapter Compatible With 20mm Pipe+16 Dowels Glitter Pen Holder Epoxy Pen Attachment For Cup Turner DIY Craft Epoxy Resin Pens Tumbler Holder For Crafts Quality material: Our Pen turner foams set is made of high density EVA foam moderate hardness with little elasticity, which will ensure your Pen stay in place and keep it level, so it doesn't slip out