If clay does get stuck in the roller, gently brush out with a soft toothbrush and warm water. Simply roll the HR (Hand Roller) with your hand or roller board across a slab of clay. Hand Rollers (HRs) are a great size to add detail to your pottery or polymer clay projects. Here is a 3.25/3.00-8 (13x3) scooter inner tube with a straight valve stem. These tubes are commonly referred to as 13x3 or 325/3.00-8, depending on the manufacturer Discover MKM hand roller pottery tools – simply roll to create clean patterns in clay. Explore hand rollers for clay, perfect for all skill levels at... HR-56 Fish Scales - Keramiek en Glazuur 4 inches in length and 0.6 inches in diameter. MKM Pottery Tools Hand Rollers (HR) MKM Pottery Tools Hand Rollers (HRs) are precision carved to create crisp, detailed impressions into your clay work. At 4 inches, MKM Pottery Tools Hand Rollers (HRs) are the second largest texture roller of the hand roller line. MKM rollers are finished with oil to ensure durability over many years of use. s MKM Pottery Tools Wood Mini Handle Rollers For Clay (RH-2 Texture Roller